A household circuit teaching board

Abstract

This utility model discloses a household circuit teaching board, including a demonstration board, a circuit, and commonly used household components. It also includes: a first pair and a second pair of banana plugs, respectively installed at the ends of the wires at the corresponding positions of the first and second breaks in the live wire; a third pair of banana plugs, installed at the ends of the wires at the position of the third break in the neutral wire; a wire module selectively connecting one or more pairs of the three banana plugs; and an overcurrent demonstration module and / or an electric shock demonstration module connected to one or more pairs of the three banana plugs. This household circuit teaching board incorporates commonly used household circuit components and allows for the selective connection of different demonstration modules to the circuit. This enables students to intuitively understand the structure of household circuits and demonstrates different experimental phenomena when the circuit current is too high, as well as the situation of electric shock, allowing students to fully understand the function of each component in the circuit and improving teaching quality.

Description

Technical Field

[0001] This utility model relates to the field of teaching experiment and demonstration equipment technology, and in particular to a household circuit teaching board. Background Technology

[0002] In junior high school physics teaching, when teaching the lesson "Household Electricity" in the ninth grade of compulsory education, household circuits are often demonstrated through experiments. During the experiments, the composition of household circuits is mostly shown on a teaching board.

[0003] Currently, most household circuit demonstration boards used in classrooms include the basic structure of household circuits. These boards show the components, such as electricity meters, circuit breakers, knife switches, light bulbs, and sockets, as well as the connections between appliances and their functionality. However, the demonstration functions of existing boards are limited. For example, textbooks explain the functions of fuses, circuit breakers, and residual current devices (RCDs). When demonstrating these components, the function of fuses is usually shown in low-voltage circuits, where they will blow at 220V. Currently, there are no demonstration boards on the market that can demonstrate fuse blowing. Furthermore, there are no demonstration boards that can simulate the function of an RCD when a person is electrocuted, nor are there demonstration boards that can demonstrate the circuit breaker tripping when a wire catches fire due to excessive current or when a short circuit occurs.

[0004] It is evident that those skilled in the art urgently need a household circuit teaching board that can demonstrate different experimental phenomena when the circuit current is too high, as well as the phenomenon of electric shock to humans. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems existing in the prior art and provide a household circuit teaching board, which is equipped with commonly used components in household circuits and allows for the selective connection of different demonstration modules to the circuit. This allows students to intuitively understand the structure of household circuits while also demonstrating different experimental phenomena when the circuit current is too high and the situation of electric shock, thereby enabling students to fully understand the function of each component in the circuit and improving the quality of teaching.

[0006] To achieve the above-mentioned objectives of this utility model, this utility model provides a household circuit teaching board, including a demonstration board, a circuit set on the demonstration board, and a main switch, an electricity meter, a circuit breaker with leakage protection, an ammeter, two screw-type lamp holders, two five-hole sockets, and two switches set on the circuit. Furthermore, it includes: a first pair of banana-shaped sockets and a second pair of banana-shaped sockets, respectively set at the two ends of the wires at corresponding positions of the first and second breaks in the live wire of the circuit; a third pair of banana-shaped sockets, set at the two ends of the wires at the position of the third break in the neutral wire of the circuit; a wire module selectively connecting one or more pairs of the three banana-shaped sockets; an overcurrent demonstration module for demonstrating different experimental phenomena when the current is too high in the circuit, and / or an electric shock demonstration module for demonstrating electric shock when a person touches the circuit, respectively connected to one or more pairs of the three banana-shaped sockets.

[0007] Preferably, the wire module includes three sets of wire assemblies, the wires of the three sets of wire assemblies are the same or different in length, and the two ends of the wires of each set of wire assemblies are respectively connected to banana plugs.

[0008] Preferably, the overcurrent demonstration module includes one or more of the following: a fuse demonstration component for demonstrating the function of a fuse, a fire demonstration component for demonstrating fire phenomena, an air switch demonstration component for demonstrating an air switch, and a short circuit demonstration component for demonstrating short circuit phenomena.

[0009] Preferably, the fuse demonstration assembly includes a fuse, an insulating plate for fixing the fuse, and a pair of banana plugs at both ends of the fuse; the fire demonstration assembly includes copper wire wrapped with outer paper, an insulating plate for fixing the copper wire, and a pair of banana plugs at both ends of the copper wire; the air switch demonstration assembly includes a single-phase air switch, an insulating plate for fixing the single-phase air switch, and a pair of banana plugs respectively disposed on the neutral and live wires electrically connected to the single-phase air switch; the short-circuit demonstration assembly includes the air switch demonstration assembly, a neutral wire, a live wire, a screw-type light bulb and a five-hole socket connected in parallel in the circuit formed by the neutral and live wires, a switch disposed between the screw-type light bulb and the live wire, banana plugs respectively disposed between the screw-type light bulb and the neutral and live wires, plugs electrically connected to the neutral and live wires respectively, and a short-circuit assembly with its two ends for being inserted into the banana plugs respectively.

[0010] Preferably, the electric shock demonstration module includes a dummy for electrical contact with the neutral and / or live wires, a leakage protection component for demonstrating the function of leakage protection, and an electric shock circuit component for demonstrating the electric shock situation of the dummy.

[0011] Preferably, the dummy is provided with a light-emitting light strip, two hand wires electrically connected to the light strip and located at the hands of the dummy for contact with the neutral and / or live wires, and a foot wire located at the feet of the dummy for contact with the ground wire.

[0012] Preferably, the leakage protection assembly includes an air switch with leakage protection, an insulating plate for fixing the air switch with leakage protection, and four banana plugs respectively disposed on a pair of neutral wires and a pair of live wires electrically connected to the air switch with leakage protection.

[0013] Preferably, the electric shock circuit assembly includes a neutral wire and a live wire, a wooden board for fixing the neutral wire and the live wire, exposed copper wires respectively disposed on the neutral wire and the live wire, and a plug electrically connected to the neutral wire and the live wire.

[0014] Preferably, the electric shock circuit assembly further includes an insulating plate for simulating the formation of a current loop when a dummy is electrocuted and a groundable metal plate.

[0015] Furthermore, it also includes a protective cover rotatably connected to the top of the demonstration board for covering the circuit, and a limit switch disposed on the top of the demonstration board and whose opening or closing state relative to the demonstration board controls the disconnection or connection of the main circuit.

[0016] Compared with the prior art, the beneficial effects of this utility model household circuit teaching board are reflected in the following aspects:

[0017] This utility model provides a household circuit demonstration board. The board displays a household circuit and its commonly used components. A pair of banana-shaped sockets are placed at the ends of the broken wires (live and neutral). By selectively inserting wire assemblies, overcurrent demonstration modules, or electric shock demonstration modules into these sockets to connect the circuit, students can intuitively understand the structure of a household circuit. The board also demonstrates different experimental phenomena that occur when the current is too high. In particular, the electric shock module demonstrates the effects of electric shock on a person. This allows students to build a physical model of the household circuit structure, fully understand the function of each component, deepen their understanding, and improve teaching quality.

[0018] The present invention will now be described in detail with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of the household circuit teaching board of this utility model (the protective cover is in the fastened state);

[0020] Figure 2 This is a structural schematic diagram of the household circuit teaching board of this utility model (the protective cover is in the removed state);

[0021] Figures 3-5 This is a structural schematic diagram of the three sets of wire assemblies in the wire module of this utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the fuse demonstration assembly of this utility model;

[0023] Figure 7 This is a schematic diagram of the fire demonstration component of this utility model;

[0024] Figure 8 This is a schematic diagram of the structure of the air switch demonstration component of this utility model;

[0025] Figure 9 This is a schematic diagram of the leakage current protection component of this utility model;

[0026] Figure 10 This is a schematic diagram of the structure of the contact circuit assembly of this utility model;

[0027] Figure 11 This is a schematic diagram of the short-circuit demonstration component of this utility model;

[0028] Figure 12 This is a schematic diagram of the dummy of this utility model receiving an electric shock with one hand;

[0029] Figure 13 This is a schematic diagram of the structure of the dummy's hands when it is electrocuted;

[0030] Figure 14 This is the schematic diagram of the household circuit teaching board of this utility model. Detailed Implementation

[0031] This utility model provides a household circuit teaching board for exploring the structure of household circuits. It can be used by teachers for teaching demonstrations or by students for experiments. Through teaching demonstrations and hands-on experiments, it can help students better understand household circuits and daily electricity use.

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] like Figures 1-14The figures show the structure of the household circuit teaching board provided by this utility model and the structural diagrams of different demonstration components. As can be seen from the figures, the household circuit teaching board of this utility model includes a demonstration board, a circuit set on the demonstration board, and commonly used household components installed in the circuit, such as a main switch, an electricity meter, a circuit breaker with leakage protection, an ammeter, two screw-type lamp holders, two five-hole sockets, and two switches. The two screw-type lamp holders and two five-hole sockets are connected in parallel, and the two switches are connected in series with the two screw-type lamp holders. In addition, it also includes: a first pair of banana-shaped sockets and a second pair of banana-shaped sockets, respectively set at the two ends of the wires at the corresponding positions of the first and second breaks in the live wire in the circuit; a third pair of banana-shaped sockets, set at the two ends of the wires at the position of the third break in the neutral wire in the circuit; a wire module selectively connecting one or more pairs of the three pairs of banana-shaped sockets; an overcurrent demonstration module for demonstrating different experimental phenomena when the current is too high in the circuit, and / or an electric shock demonstration module for demonstrating the electric shock situation when a person touches the circuit, connected to one or more pairs of the three pairs of banana-shaped sockets respectively.

[0034] Specifically, such as Figure 1 , Figure 2 As shown, the demonstration board of this utility model has a pair of bases 1 on both sides of its bottom for insertion, allowing the demonstration board 2 to be placed flat on a flat table. The demonstration board is equipped with a home education circuit. On one side of the front of the demonstration board (e.g....) Figure 1 , Figure 2 An electricity meter 5 is installed on the upper part of the left side shown in the diagram. The electricity meter is electrically connected to the main switch 10. The power supply can be an external power source, which is connected to the external power source through a plug (not shown in the diagram). Below the electricity meter, there is a residual current circuit breaker 3 and an indicator light 4 that are electrically connected to it. The circuit, including the neutral wire and the live wire, is laid out on the upper right side of the demonstration board, and two screw-type lamp holders 8 and 9 for screwing in screw-type light bulbs and two five-hole sockets 12 are installed in parallel on the circuit. Each screw-type lamp holder is connected in series with a switch 13 for controlling the on and off of its circuit. In addition, an ammeter 14 is installed on the neutral wire led out from the residual current circuit breaker.

[0035] To demonstrate different phenomena in household electrical circuits, this invention sequentially cuts two open circuits on the live wire leading from the residual current circuit breaker, namely, the first open circuit and the second open circuit, as shown below. Figure 1 , Figure 2As shown, a first pair of banana sockets A and B are installed at both ends of the wire at the first open circuit location, and a second pair of banana sockets C and D are installed at both ends of the wire at the second open circuit location. It can be seen that there is no wiring connection between banana sockets A and B, no wiring connection between banana sockets C and D, but a wiring connection between banana sockets B and C. Furthermore, an open circuit is created on the neutral wire parallel to the live wire, i.e., a third open circuit. A third pair of banana sockets E and F are installed at both ends of the wire at the third open circuit location, and there is no wiring connection between the two banana sockets. During assembly, the ammeter can be placed on the neutral wire, between banana socket F and screw-type lamp holder 8.

[0036] In addition to multiple pairs of banana-shaped sockets, this invention also includes a wire module, an overcurrent demonstration module, and an electric shock demonstration module, which are selectively connected to one or more pairs of the three banana-shaped sockets according to experimental needs. These modules connect broken circuits and demonstrate different situations that may occur in household electricity use. For example, the wire module connects the corresponding circuits, the overcurrent demonstration module demonstrates different experimental phenomena when the current in the circuit is too high, and the electric shock demonstration module demonstrates the electric shock that may occur when a person comes into contact with the circuit.

[0037] The conductor module includes three sets of conductor assemblies, such as... Figures 3-5 As shown, the three sets of wire assemblies have basically the same structure, each including a wire 161 and banana plugs 162 at both ends of the wire. The only difference between the three sets of wire assemblies is the length of the wires. For example, the wire length of the first wire assembly 16 is longer than that of the second wire assembly 17 and the third wire assembly 18, while the wire lengths of the second and third wire assemblies can be the same or different. In the design, the lengths of the three sets of wire assemblies can be comparable to the spacing between the three pairs of banana plugs. For example, the spacing between the two banana plugs of the first wire assembly matches the spacing between banana plugs C and D, the spacing between the two banana plugs of the second wire assembly matches the spacing between banana plugs A and B, and the spacing between the two banana plugs of the third wire assembly matches the spacing between banana plugs E and F.

[0038] The overcurrent demonstration module includes one or more of the following: fuse demonstration component 19 for demonstrating the function of a fuse, fire demonstration component 20 for demonstrating fire phenomena, air switch demonstration component 21 for demonstrating the function of an air switch, and short circuit demonstration component 24 for demonstrating short circuit phenomena.

[0039] Specifically, such as Figure 6 As shown, the fuse demonstration assembly includes a fuse 192, an insulating plate 191 for fixing the fuse, and a pair of banana plugs 193 disposed at both ends of the fuse. The spacing between the pair of banana plugs matches the spacing between banana sockets A and B.

[0040] like Figure 7As shown, the fire demonstration assembly includes a copper wire 204 wrapped in outer paper 202, an insulating plate 201 for fixing the copper wire, and a pair of banana plugs 203 disposed at both ends of the copper wire. The spacing between the pair of banana plugs matches the spacing between banana sockets C and D.

[0041] like Figure 8 As shown, the air switch demonstration assembly includes a single-phase air switch 212, an insulating plate 211 for fixing the single-phase air switch, and a pair of banana plugs 213 and 214 respectively disposed on the neutral and live wires electrically connected to the single-phase air switch. The spacing between the pair of banana plugs 213 and 214 matches the spacing between banana sockets A and B.

[0042] The short-circuit demonstration assembly includes the aforementioned air switch demonstration assembly, and also includes, for example, the following: Figure 11 The short-circuit demonstration board structure shown includes an insulating plate 241 and a neutral wire, a live wire, a screw-type light bulb 244 connected in parallel with the live wire to form a circuit, a switch 245 between the screw-type light bulb and the live wire, a pair of banana plugs 242 respectively between the screw-type light bulb and the neutral and live wires, a plug 243 electrically connected to the neutral and live wires respectively, and a wire short-circuit assembly whose two ends are for insertion into the banana plugs respectively. The wire short-circuit assembly can adopt the structure of the above-described wire assembly, including a wire and a pair of banana plugs at both ends of the wire. The pair of banana plugs can be inserted into the pair of banana plugs 242 on the live and neutral wires respectively to directly connect the neutral and live wires, thereby achieving the purpose of short-circuiting the circuit. In addition, a resistor (not shown in the figure) for controlling the short-circuit current can also be provided on the back of the insulating plate.

[0043] The electric shock demonstration module of this utility model, which is used to demonstrate the electric shock situation when a person touches the circuit, includes a dummy 26 for electrical contact with the neutral wire and / or live wire, a leakage protection component 22 for demonstrating the leakage protection function, and an electric shock circuit component 23 for demonstrating the electric shock situation of the dummy.

[0044] like Figure 12 , Figure 13 As shown, the dummy is equipped with a light-emitting LED strip 261, two hand wires electrically connected to the LED strip and located at the dummy's hands for contact with the neutral and / or live wires, and a foot wire located at the dummy's feet for contact with the ground wire. Banana plugs 262 extend from the ends of the foot wires. The dummy can be a conventional dummy doll, and the distance between the hands is adjustable. The LED strip extends from the dummy's hands to the upper body and then to the legs.

[0045] like Figure 9As shown, the residual current device (RCD) assembly includes a residual current circuit breaker 222, an insulating plate 221 for fixing the RCD, and four banana plugs 223, 224, 226, and 225 disposed on a pair of neutral wires and a pair of live wires electrically connected to the RCD. The spacing between banana plugs 223 and 224 matches the spacing between banana sockets E and F, and the spacing between banana plugs 226 and 225 matches the spacing between banana sockets A and B. The RCD refers to a combination structure in the prior art that includes a residual current device (RCD) and an air circuit breaker.

[0046] like Figure 10 As shown, the electric shock circuit assembly includes a neutral wire and a live wire, a wooden board 231 for fixing the neutral wire and the live wire, exposed copper wires 232 respectively installed on the neutral wire and the live wire, and a plug 233 electrically connected to the neutral wire and the live wire. The hand wires on the dummy's hands can be connected to the exposed copper wires on the live wire or the neutral wire respectively.

[0047] In addition, the electric shock circuit assembly of this utility model also includes an insulating plate 27 for simulating the formation of a current loop when a dummy is electrocuted (e.g., Figure 13 (As shown) and a groundable metal plate 25. (As shown) Figure 12 As shown, a banana plug 251 is provided on the groundable metal plate, which can be plugged into the ground socket 11 on the back of the demonstration board. A banana socket 252 is provided at the connection between the banana plug and the metal plate. The banana plug 262 extending from the dummy's feet can be inserted into the banana socket 252.

[0048] Furthermore, this utility model also has a protective cover 6 rotatably connected to the top of the demonstration board. The protective cover can cover the three pairs of banana sockets in the circuit of the demonstration board to protect the structure of the circuit. In addition, a limit switch 7 is fixedly installed at the top of the demonstration board corresponding to the position of the protective cover. The limit switch is electrically connected between the main switch and the electricity meter. The opening and closing of the protective cover relative to the demonstration board can control the disconnection or connection of the main circuit by the limit switch.

[0049] The protective cover serves the following main purposes: ① to control the on / off state of the limit switch; ② to prevent the fuse from blowing and scattering debris during the experiment; ③ to prevent teachers from touching exposed wires and getting electric shocks during the experiment.

[0050] During manufacturing, the protective cover can be made of acrylic sheet into a square shape. Two rows of small holes are made on the top surface of the cover. Hinges are used to connect the cover to the demonstration board. When the cover is fastened to the demonstration board, it can cover three pairs of banana plugs A, B, C, D, E, and F, as well as different experimental demonstration modules connected through these three pairs of banana plugs. A limit switch is located on the upper side of the demonstration board, below the protective cover, and the limit switch controls the on / off state through the cover. When the protective cover is fastened to the demonstration board (e.g....), Figure 1(As shown in the diagram), the limit switch connects the circuit. When the protective cover is opened, the limit switch disconnects the circuit. This ensures that the circuit is not energized when changing the various demonstration modules in the experiment, guaranteeing the safety of the teacher even if they forget to turn off the main switch during operation. Furthermore, the two rows of small holes on the top surface of the protective cover allow for convenient and rapid smoke extraction during fire experiments.

[0051] The following describes the process of connecting different demonstration components between banana sockets A and B, C and D, and E and F in this utility model's household circuit teaching board to achieve different experimental phenomena.

[0052] I. Demonstrate the phenomenon that the greater the total power of the electrical appliances, the greater the total current.

[0053] By connecting appliances of different power ratings into the circuit, the demonstration shows that the total current increases as the total power of the appliances increases. Excessive current can easily cause fires, blow fuses, trip circuit breakers, and trip circuit breakers in the event of a short circuit, as detailed below:

[0054] 1. Changes in total power and total current of electrical appliances: Connect the following connections between banana sockets: A and B, C and D, and E and F respectively. Figures 3-5 The wiring modules shown are as follows: the two banana plugs of the first wiring assembly are inserted into banana sockets C and D respectively; the two banana plugs of the second wiring assembly are inserted into banana sockets A and B respectively; and the two banana plugs of the third wiring assembly are inserted into banana sockets E and F respectively, connecting the corresponding neutral and live wires to make the circuit continuous. Then, two switches 8 and 9 control the simultaneous or intermittent on / off of two screw-type light bulbs, or by plugging appliances of different wattages into the two five-hole sockets 12, it is demonstrated that the greater the total power of the appliances, the greater the total current in the circuit. The current in the circuit can be observed using the ammeter on the demonstration board.

[0055] 2. Excessive current can easily cause a fire: (The following text appears to be unrelated and possibly machine-translated gib Figure 7 In the fire demonstration assembly shown, the two banana plugs 203 at both ends of the copper wire 204 of the outer wrapping paper 202 are respectively inserted into a pair of banana sockets C and D. The two banana plugs of the second wire assembly are respectively inserted into two banana sockets A and B. The two banana plugs of the third wire assembly are respectively inserted into two banana sockets E and F. By making the two screw-type bulbs on the demonstration board light up at the same time, and / or by plugging a more powerful electrical appliance into the two five-hole sockets 12, the situation of the paper on the surface of the copper wire catching fire when the current is too large can be demonstrated.

[0056] 3. The fuse will blow if the current is too high: (The rest of the text appears to be a fragment and requires further context for Figure 6The fuse 192 in the fuse demonstration assembly shown has a pair of banana plugs 193 at both ends inserted into two banana sockets A and B respectively. The two banana plugs of the first wire assembly are inserted into two banana sockets C and D respectively. The two banana plugs of the third wire assembly are inserted into two banana sockets E and F respectively. By making the two screw-type bulbs on the demonstration board light up at the same time, and / or by plugging electrical appliances into the two five-hole sockets 12, the situation of the fuse blowing and cutting off the circuit in time when the current is too large can be demonstrated.

[0057] 4. The circuit breaker will trip when the current is too high: (The following is a possible explanation:) Figure 8 In the circuit breaker demonstration assembly shown, a pair of banana plugs 213 and 214 are inserted into banana sockets A and B respectively. The two banana plugs of the first wire assembly are inserted into two banana sockets C and D respectively. The two banana plugs of the third wire assembly are inserted into two banana sockets E and F respectively. By making the two screw-type bulbs on the demonstration board light up simultaneously, and / or by plugging electrical appliances into the two five-hole sockets 12, it can be demonstrated that the circuit breaker can cut off the circuit in time when the current is too high.

[0058] 5. The air switch will trip during a short circuit: (The following is a repetition of the previous sentence) Figure 8 In the circuit breaker demonstration assembly shown, a pair of banana plugs 213 and 214 are inserted into banana sockets A and B respectively. The two banana plugs of the first wire assembly are inserted into banana sockets C and D respectively. The two banana plugs of the third wire assembly are inserted into banana sockets E and F respectively. Then, as shown... Figure 11 The plug 243 shown is inserted into any of the five-hole sockets 12 on the demonstration board. The pair of banana plugs of the wire short-circuit assembly are respectively inserted into the pair of banana sockets 242 on the insulating board 241 located on the live wire and the neutral wire. This can demonstrate the situation where the air switch is turned off to cut off the circuit when the circuit is short-circuited.

[0059] It should be noted that the electrical appliances connected to the circuit when the demonstration current is too high can be determined according to the actual situation.

[0060] II. Demonstration of electric shock phenomena in different situations

[0061] By connecting an electric shock demonstration module to the circuit, it is possible to demonstrate electric shock phenomena in dummies under different circumstances.

[0062] 1. When the dummy touches the live wire with one hand and its feet are grounded, the residual current device (RCD) cuts off the circuit, ensuring the dummy's safety. (The following text appears to be unrelated and possibly a separate instruction: "will be handled as follows...") Figure 9 The two banana plugs 223 and 224 of the circuit breaker 222 with leakage protection shown are inserted into the two banana sockets E and F respectively, and the two banana plugs 226 and 225 are inserted into the two banana sockets A and B respectively. The two banana plugs of the first conductor assembly are inserted into the two banana sockets C and D respectively. Figure 12The banana plug 251 on the groundable metal plate 25 is inserted into the ground socket 11 on the back of the demonstration board. A dummy is placed on the metal plate 25, and the banana plug 262 extending from the dummy's feet is inserted into the banana socket 252 on the metal plate. The wire from the dummy's right hand is then connected to... Figure 10 The exposed copper wires 232 on the live wire of the electric shock circuit assembly shown are connected together to form an electrical circuit. When the plug 233 in the electric shock circuit assembly is inserted into any of the five-hole sockets 12 on the demonstration board, the LED light strip from the right hand to the foot behind the dummy can be seen to flash once. The leakage current protection device then cuts off the circuit, thereby protecting personal safety.

[0063] In addition, the electric shock situation of a person standing on the ground can be demonstrated by having a dummy touch two exposed copper wires on the live wire with its hands.

[0064] 2. When the dummy touches the live wire and neutral wire with both hands respectively, and its feet are insulated, the residual current device (RCD) fails to cut off the circuit, and the dummy suffers an electric shock: [The following is a separate, unrelated sentence:] ... Figure 9 The four banana plugs of the circuit breaker 222 with leakage protection shown are inserted into banana sockets E, F, A, and B respectively. The two banana plugs of the first conductor assembly are inserted into banana sockets C and D respectively. The dummy is placed in... Figure 13 On the insulating board shown, the wire of the dummy's right hand is connected to... Figure 10 The exposed copper wires 232 on the live wire of the electric shock circuit assembly shown are connected together, and the wire of the dummy's left hand is connected to the exposed copper wire on the neutral wire, so that an electrical circuit is formed between the dummy's hands. When the plug 233 in the electric shock circuit assembly is inserted into any of the five-hole sockets 12 on the demonstration board, the LED light strip behind the dummy from right to left hand can be seen to light up. The leakage current protection device does not cut off the circuit, thus failing to protect the person's safety. At this time, the person will be electrocuted.

[0065] In addition, the scenario of a person standing on an insulator getting an electric shock with one hand can be demonstrated by having a dummy touch the exposed copper wire on the live wire with one hand.

[0066] It should be noted that the parameters of the leakage current protection device in the electric shock demonstration module and the resistance of the LED strip on the dummy are determined according to the experimental conditions.

[0067] As can be seen from the above, this utility model household circuit teaching board can demonstrate the process of fire caused by excessive current in a household circuit under a voltage of 220V, fuse blowing due to excessive current, circuit breaker disconnecting due to excessive current, and circuit breaker disconnecting the circuit when there is a short circuit. It can also demonstrate the situation of a dummy standing on the ground touching the live wire with one hand and two hands, as well as the situation of a dummy standing on an insulator touching the live wire with one hand and two hands.

[0068] The circuit experiment section of this invention is conducted inside a transparent protective cover, and the three pairs of banana plugs can be connected to different demonstration modules to achieve different experimental effects, making it a multi-purpose board. The application of the dummy also enables experiments that cannot be performed in reality, which will be very impressive to students. The application of the short-circuit demonstration board structure also allows students to see the experimental effects without affecting the next level of circuit.

[0069] Although the present invention has been described in detail above, it is not limited thereto. Those skilled in the art can make modifications based on the principles of the present invention. Therefore, all modifications made in accordance with the principles of the present invention should be understood as falling within the protection scope of the present invention.

Claims

1. A home circuit demonstration board comprising a demonstration board, a circuit provided on the demonstration board, and a master switch, an electric energy meter, an air switch with leakage protection, an ammeter, two screw lamp holders, two five-hole sockets, and two switches provided on the circuit, characterized in that, Also includes: The first pair of banana sockets and the second pair of banana sockets are respectively set at the two ends of the wires at the corresponding positions of the first and second breaks cut sequentially from the live wire in the circuit. The third pair of banana sockets are installed on the two ends of the wires at the third break point cut off from the neutral wire in the circuit. Selectively connect one or more pairs of wire modules from three banana plugs; An overcurrent demonstration module, connected to one or more of the three pairs of banana sockets, for demonstrating different experimental phenomena when the current in the circuit is too high, and / or an electric shock demonstration module for demonstrating the electric shock situation when a person touches the circuit.

2. The home circuit teaching panel according to claim 1, characterized in that The wire module includes three sets of wire assemblies. The wires in the three sets of wire assemblies may be the same or different in length, and each set of wire assemblies has banana plugs connected to both ends of the wires.

3. The home circuit teaching panel according to claim 1 or 2, characterized in that The overcurrent demonstration module includes one or more of the following: a fuse demonstration component for demonstrating the function of a fuse, a fire demonstration component for demonstrating fire phenomena, an air switch demonstration component for demonstrating the function of an air switch, and a short circuit demonstration component for demonstrating short circuit phenomena.

4. The household circuit teaching board according to claim 3, characterized in that: The fuse demonstration assembly includes a fuse, an insulating plate for fixing the fuse, and a pair of banana plugs at both ends of the fuse. The fire demonstration component includes copper wire wrapped in outer paper, an insulating plate for fixing the copper wire, and a pair of banana plugs at both ends of the copper wire. The air switch demonstration assembly includes a single-phase air switch, an insulating plate for fixing the single-phase air switch, and a pair of banana plugs respectively installed on the neutral and live wires that are electrically connected to the single-phase air switch. The short-circuit demonstration assembly includes the air switch demonstration assembly, a neutral wire, a live wire, a screw-type light bulb and a five-hole socket connected in parallel in the circuit formed by the neutral and live wires, a switch set between the screw-type light bulb and the live wire, banana-shaped sockets set between the screw-type light bulb and the neutral and live wires respectively, a plug electrically connected to the neutral and live wires respectively, and a wire short-circuit assembly whose two ends are used to be inserted into the banana-shaped sockets respectively.

5. The household circuit teaching board according to claim 1, characterized in that, The electric shock demonstration module includes a dummy for electrical contact with the neutral and / or live wires, a leakage protection component for demonstrating the function of leakage protection, and an electric shock circuit component for demonstrating the electric shock situation of the dummy.

6. The home circuit teaching panel according to claim 5, wherein The dummy is equipped with a light-emitting LED strip, two hand wires for contacting the neutral and / or live wires located at the hands of the dummy and a foot wire for contacting the ground wire located at the feet of the dummy.

7. The home circuit teaching panel according to claim 5 or 6, characterized in that The leakage protection assembly includes an air switch with leakage protection, an insulating plate for fixing the air switch with leakage protection, and four banana plugs respectively installed on a pair of neutral wires and a pair of live wires that are electrically connected to the air switch with leakage protection.

8. The home circuit teaching panel according to claim 7, characterized in that The electric shock circuit assembly includes a neutral wire and a live wire, a wooden board for fixing the neutral wire and the live wire, exposed copper wires respectively installed on the neutral wire and the live wire, and a plug electrically connected to the neutral wire and the live wire.

9. The home circuit teaching panel according to claim 8, characterized in that The electric shock circuit assembly also includes an insulating plate for simulating the formation of a current loop when a dummy is electrocuted and a groundable metal plate.

10. The home circuit teaching panel according to claim 1, wherein It also includes a protective cover rotatably connected to the top of the demonstration board for covering the circuit, and a limit switch located on the top of the demonstration board and whose opening or closing state relative to the demonstration board controls the disconnection or connection of the main circuit.

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