Combined teaching aid for exploring distribution characteristics and principles of ohmmeter resistor scale marks

Abstract

The utility model discloses a combined teaching aid for exploring distribution characteristics and principles of ohmmeter resistor scale marks. The combined teaching aid comprises a support, a supporting plate, a resistance measuring device, an ohmmeter structure demonstration device, an electrical element and a wire. The supporting plate is mounted on the bracket; the resistance measuring device and the ohmmeter structure demonstration device are installed on the supporting plate from top to bottom. The two groups of electrical elements are respectively an electrical element A and an electrical element B; the electrical element A is detachably mounted on the resistance measuring device; the electrical element B is detachably mounted on the rectangular module 2 ohmmeter structure demonstration device; the lead comprises a common lead and a red and black meter pen; the common wires are used for connecting electrical elements; the red-black meter pen comprises a red meter pen and a black meter pen and is used for externally connecting the electrical component with a to-be-tested component; according to the utility model, the internal structure of the ammeter is visually displayed, thereby facilitating teaching of teachers and understanding of students, and improving teaching effects; students can master knowledge through experimental operation, synchronous display of circuit principles and experimental phenomena is realized, and understanding is deepened.

Description

TECHNICAL FIELD

[0001] The utility model relates to teaching equipment technical field, concretely relates to is a ohmmeter resistance grade graduation line distribution characteristic and principle inquiry combination teaching aid. BACKGROUND

[0002] In the current physical basic electricity teaching, usually divided into two parts of drawing circuit diagram and experimental demonstration, wherein the drawing circuit diagram is aimed at imparting circuit principle, and the experimental demonstration is used for verifying these theories, however, facing the complex extension circuit teaching, the existing teaching mode causes students to be difficult to correspond the physical demonstration with the theory wiring because of the complex wiring, this not only influences the teaching efficiency, also reduces the teaching effect. In addition, the existing teaching equipment is mainly used for experimental demonstration, lacks the tool that can exhibit circuit principle and experimental phenomenon simultaneously, this limits the intuitiveness and interactivity of teaching.

[0003] Patent CN 201610746981.3 discloses a kind of multifunctional teaching aids for physical laboratory, including microammeter, universal circuit board, host computer, power supply module, protection circuit and simulator, the microammeter right side is equipped with voltmeter and ohmmeter, the ohmmeter right side is equipped with pilot lamp, the microammeter left side is provided with switch and emergency stop button, the microammeter below is provided with tuning knob, the universal circuit board left side is fixed with output power interface, the power supply module output end and self-checking device input end electric connection, the filter output end is electrically connected with universal circuit board and output power interface input end respectively, the output power interface output end and external equipment input end electric connection, the external equipment output end and simulator input end electric connection. Through the form of integrated circuit, each circuit is modularized, so that the equipment meets the functional requirements of multiple physical experiments, complete function, simplifies experimental complexity.

[0004] The patent CN 202022595068.2 discloses a physical basic electrical half-demonstration teaching aid, which comprises a demonstration panel, a support, electrical elements and wires; the demonstration panel is arranged on the support, and the electrical elements are detachably connected to the demonstration panel; the demonstration panel is provided with a jack, and the elements are provided with a plug column; the plug column and the jack are spliced to realize detachable installation of the electrical elements on the demonstration panel; and the wires are used to connect the plug columns of the corresponding electrical elements on the back of the demonstration panel. The design can draw a line between the physical electrical elements and annotate the electrical elements, so that the circuit panel formed can enable theoretical teaching and phenomenon verification to be performed simultaneously, the face line is clear, and the teacher and the student can understand it easily; when the electrical elements are operated, the generated electrical phenomena can be directly and real-timely displayed, so that the circuit principle and the experimental phenomena are combined and displayed synchronously. Through the display of the physical teaching aid, the connection between the circuit and the electrical elements is more simply and clearly displayed, the students can instantly understand the mystery of the complex structure, the students' interest is attracted, and the classroom atmosphere is active.

[0005] However, the scale line distribution of the ohmmeter is different from that of the ammeter and the voltmeter in two aspects: one is the position of the zero ohm scale line, and the other is the uneven distribution of the scale lines. The existing physical teaching aid lacks a physical teaching aid about the circuit principle of the ohmmeter, so in the teaching process, due to the complex and difficult-to-understand internal structure of the ohmmeter, the students are difficult to understand the connection between the circuit diagram and the actual wiring, and the students' understanding of the knowledge points is insufficient. Practical new type content

[0006] The utility model aims at providing a modular design, intuitive teaching, and simple operation ohmmeter resistance scale line distribution characteristic and principle inquiry combination teaching aid, in order to solve the technical problem that the students do not understand the internal structure and scale line distribution of the ohmmeter due to the lack of teaching aids, thereby affecting the teaching efficiency and teaching effect of teachers.

[0007] In order to solve the above technical problems, the utility model adopts the following scheme:

[0008] An ohmmeter resistance scale distribution characteristic and principle exploration combination teaching aid, including support, support plate, resistance measuring device, ohmmeter structure demonstration device, electrical element and wire, the support plate is fixedly installed on the support, the resistance measuring device and ohmmeter structure demonstration device are installed on the support plate from top to bottom, the electrical element is equipped with two groups, is electrical element A and electrical element B respectively, the electrical element A can be detachably installed on the resistance measuring device, and electrical element A is installed on the resistance measuring device and is modified into ohmmeter, the electrical element B can be detachably installed on the ohmmeter structure demonstration device, and electrical element B is installed on the ohmmeter structure demonstration device and presents the principle of ohmmeter structure, to facilitate students to understand, the wire includes ordinary wire and red and black meter pen, the ordinary wire is used to connect the electrical element, the red and black meter pen includes red meter pen and black meter pen and is used to the electrical element external test element.

[0009] Further, the electrical element A includes a soldering plate, a microammeter and a dry battery, the soldering plate is welded with a custom resistance A, the soldering plate, the microammeter and the dry battery are connected in sequence by the ordinary wire, and the red and black meter pens are installed on the soldering plate and the dry battery respectively.

[0010] Further, the resistance measuring device is provided with a magnetic force strip and a plurality of marking magnets, the magnetic force strip is fixedly installed on the back of the resistance measuring device, and the plurality of marking magnets are adsorbed on the front of the resistance measuring device through the magnetic force strip.

[0011] Further, the electrical element B includes a power supply, a sliding resistance, a fixed resistance B, a current meter and an adjusting resistance (7), the power supply includes a power supply one and a power supply two, the fixed resistance B includes a fixed resistance one, a fixed resistance two, a fixed resistance three and a fixed resistance four, the sliding resistance includes a sliding resistance one and a sliding resistance two, the current meter, the power supply one, the power supply two, the fixed resistance three and the fixed resistance four are sequentially arranged on the upper side of the ohmmeter structure demonstration device from left to right, the fixed resistance one and the fixed resistance two are installed below the current meter from left to right, the sliding resistance one is located directly below the power supply one, the sliding resistance two is located directly below the power supply two, and the adjusting resistance (7) is installed on one side of the sliding resistance two.

[0012] Further, the ohmmeter structure demonstration device is provided with six gears, which are A1, A2, A3, A4, A5 and A6 from left to right, the black meter pen is adjusted through the black meter pen, the red meter pen is connected with the ammeter, and the red meter pen and the black meter pen are connected with the measured element; the A1 and A2 gears are current gears; the A3 and A4 gears are ohm gears; the A5 and A6 gears are voltage gears; when the black meter pen is located at the A2, A3, A4, A5 and A6 gears, the fixed resistor one and the fixed resistor two are connected in series and connected in parallel with the ammeter;

[0013] When the black meter pen is located at the A1 gear, the ammeter and the fixed resistor two are connected in series, and the fixed resistor one and the fixed resistor two are connected in parallel through the common wire; when the black meter pen is located at the A1 gear, the ammeter and the fixed resistor two are connected in series, and the fixed resistor one and the fixed resistor two are connected in parallel, the current borne by the ammeter is reduced through the parallel resistance, thereby increasing the measurement range of the ammeter, the ammeter is modified into a large-range ammeter, the measured element is connected in series with the modified ammeter, and the current of the measured element can be measured;

[0014] When the black meter pen is located at the A2 gear, the fixed resistor one and the fixed resistor two are connected in series and connected in parallel with the ammeter; when the black meter pen is located at the A2 gear, the fixed resistor one and the fixed resistor two are connected in series, and the fixed resistor one and the fixed resistor two connected in series are connected in parallel with the ammeter, the current flowing through the measured element is divided, a part of the current flows through the ammeter, and the other part of the current flows through the fixed resistor one and the fixed resistor two connected in parallel; compared with the fixed resistor one connected in parallel in the A1 gear and the fixed resistor one and the fixed resistor two connected in parallel in the A2 gear, the resistance value of the fixed resistor one in the A1 gear is smaller, the smaller the parallel resistance is, the stronger the shunt effect is, and the larger the range of the ammeter is, so the range of the ammeter in the A1 gear is larger than the range of the ammeter in the A2 gear;

[0015] When the black meter pen is located at the A3 gear, the power supply one and the sliding resistor one are connected in series through the common wire; when the black meter pen is located at the A3 gear, the fixed resistor one and the fixed resistor two are connected in series, and the fixed resistor one and the fixed resistor two connected in series are connected in parallel with the ammeter, the ammeter is modified into a small-range ammeter, the power supply one is connected in series with the modified ammeter to provide power supply for the circuit, and the sliding resistor one is connected in series to modify the ohmmeter, the sliding resistor one is used for zero adjustment, the ammeter pointer is full deflection by adjusting the sliding resistor one, indicating that the resistance is zero, the measured element is connected in series after the zero adjustment, the value of the ammeter is read, the resistance can be calculated according to the ohm law combined with the voltage provided by the power supply, or the resistance corresponding to the current is calculated according to the ohm law, and then the measured element is connected in series, so that the resistance value can be directly read;

[0016] When the black pen is in A4 gear, the power supply one and the adjusting resistor and the sliding resistor two are connected in series through the common wire; when the black pen is in A4 gear, the fixed resistor one and the fixed resistor two are connected in series, and the fixed resistor one and the fixed resistor two connected in series are connected in parallel with the ammeter, and the ammeter is modified into a small range ammeter; the power supply two and the modified ammeter are connected in series to provide power supply for the circuit; the sliding resistor two is connected in series to modify into an ohmmeter; by increasing the adjusting resistor, the internal resistance of the ohmmeter can be increased, and the measurement range of the ohmmeter is increased; meanwhile, the adjusting resistor can also protect the circuit and prevent the ammeter or the circuit from being damaged by excessive current; by adjusting the sliding resistor two, the ammeter pointer is full deflection, indicating that the resistance is zero; after zero adjustment, the measured element is connected in series, and the value of the ammeter is read; combined with the voltage provided by the power supply, the resistance can be calculated according to Ohm's law, or the resistance corresponding to the current can be calculated first according to Ohm's law, and then the measured element is connected in series, so that the resistance value can be directly read;

[0017] When the black pen is in A5 gear, the fixed resistor three is connected with the ammeter; when the black pen is in A5 gear, the fixed resistor one and the fixed resistor two are connected in series, and the fixed resistor one and the fixed resistor two connected in series are connected in parallel with the ammeter, and the ammeter is modified into a small range ammeter; the modified ammeter and the fixed resistor three are connected in series to modify into a small range voltmeter; the modified voltmeter and the measured element are connected in series; the reading of the ammeter reflects the voltage across the measured element, and the voltage across the measured element can be measured.

[0018] The working principle of the utility model is as follows:

[0019] The resistance measuring device can measure multiple groups of different fixed resistors; on the front of the resistance measuring device, an ohm gear identification line is pasted, and a microammeter is fixed; the red pen and the black pen are short-circuited, the position of 0 ohm is determined, a marking magnet is attached to the resistance measuring device, the position of the pointer at this moment is recorded, and 0 is recorded; the microammeter and the different value measured resistor elements connected outside are connected in series through the red pen and the black pen; the small magnetic block prepared in advance is attracted to the position indicated by the pointer at this moment, and is marked and recorded.

[0020] When measuring the current by using the ohmmeter structure demonstration device, the red meter pen and the black meter pen are connected with the measured element, the DC power supply normally supplies power to the measured element, the current meter in A1 or A2 gear is modified into the current meter with different measuring ranges by connecting the parallel resistors with different resistance values, the modified current meter is connected with the measured element in series, the black meter pen selects A1 or A2 gear, the current value can be read by the current meter, and the greater the resistance value of the parallel resistor, the smaller the measuring range is, and the measuring range of the current meter in A1 gear is greater than that in A2 gear;

[0021] When measuring the voltage, the DC power supply normally supplies power to the measured element, the red meter pen and the black meter pen are connected with the measured element, the current meter is modified into the voltmeter by connecting the series resistors with different resistance values, the modified current meter is connected with the measured element in series, the black meter pen selects A5 or A6 gear, and the voltage value can be read by the current meter, and the greater the resistance value of the series resistor, the greater the measuring range is;

[0022] When measuring the resistance, the red meter pen and the black meter pen are connected with the measured element, the power supply one or the power supply two supplies power to the current meter in A3 or A4 gear, the current meter is modified into the ohmmeter by connecting the series slide resistors with different resistance values, the black meter pen selects A3 or A4 gear, zero is adjusted by the slide resistor first, then the modified current meter is connected with the measured resistor in series, and the resistance value can be read by the current meter.

[0023] The beneficial effects of the utility model are as follows:

[0024] The utility model discloses the internal structure principle of electric meter is arranged around the electrical element, and the whole is conducive to observing the internal component structure of electric meter, can be used for the demonstration when the teacher teaches, and the display surface circuit is clear, and it is convenient for the teacher to teach and student understanding, improves the teaching effect, can also make the student use this device and carry out the experimental exploration, exercises the student's manipulative ability, makes the student master the knowledge in the operation, and the circuit principle is combined with the experimental phenomenon and is exhibited simultaneously, and deepens the understanding. DRAWINGS

[0025] Figure 1 It is the front view structure schematic diagram of the utility model;

[0026] Figure 2 It is the front view wireless structure schematic diagram of the utility model;

[0027] Figure 3 It is the resistance measuring device back structure schematic diagram of the utility model;

[0028] Figure 4 It is the resistance measuring device circuit diagram of the utility model;

[0029] Figure 5 It is the ohmmeter structure demonstration device circuit diagram of the utility model.

[0030] Fig. 1, support; 2, support plate; 3, resistance measuring device; 31, magnetic force bar; 32, marked magnet; 4, ohmmeter structure demonstration device; 5, electrical element; 51, electrical element A; 511, soldering plate; 512, microammeter; 513, dry battery; 52, electrical element B; 53, power supply; 531, power supply one; 532, power supply two; 54, sliding resistance; 541, sliding resistance one; 542, sliding resistance two; 55, fixed resistance B; 551, fixed resistance one; 552, fixed resistance two; 553, fixed resistance three; 554, fixed resistance four; 56, galvanometer; 57, adjusting resistance; 6, wire; 61, ordinary wire; 62, red and black test pen; 621, red test pen; 622, black test pen. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application; the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, and can be the communication between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0033] The present application is a kind of ohmmeter resistance scale line distribution characteristics and principle of combination teaching aid will be further described in detail as follows: Embodiment 1

[0034] An ohmmeter resistance scale graduation line distribution characteristic and principle exploration combination teaching aid, including support 1, support plate 2, resistance measuring device 3, ohmmeter structure demonstration device 4, electrical element 5 and wire 6;The support plate 2 is fixedly installed on the support 1;The resistance measuring device 3 and ohmmeter structure demonstration device 4 are installed on the support plate 2 from top to bottom;The electrical element 5 is provided with two groups, which are electrical element A 51 and electrical element B 52 respectively;The electrical element A 51 can be detachably installed on the resistance measuring device 3;The electrical element B 52 can be detachably installed on the ohmmeter structure demonstration device 4;The wire 6 includes ordinary wire 61 and red and black meter pen 62;The ordinary wire 61 is used for connecting the electrical element 5;The red and black meter pen 62 includes red meter pen 621 and black meter pen 622, which is used for external testing element of the electrical element 5.

[0035] The working principle of the embodiment is as follows:

[0036] When in use, the resistance measuring device 3 and the ohmmeter structure demonstration device 4 are installed on the support plate 2, supported by the support 1 at the bottom end of the support plate 2, the electrical element A 51 is connected by the ordinary wire 61, so that the resistance measuring device 3 presents the shape of the ohmmeter, and the red meter pen 621 and the black meter pen 622 are used to detect the external testing element;The electrical element B 52 is arranged according to the principle of ohmmeter structure through the ordinary wire 61, so that the ohmmeter structure demonstration device 4 presents the shape of the multi-purpose meter, and different measurement parameters are measured. Example 2

[0037] The difference from example 1 is that the electrical element A 51 includes soldering plate 511, microammeter 512 and dry battery 513;Customized resistance A is welded on the soldering plate 511, and the customized resistance A is 12500Ω;The soldering plate 511, microammeter 512 and dry battery 513 are connected in sequence by the ordinary wire 61;The red and black meter pen 62 is installed on the soldering plate 511 and the dry battery 513 respectively;The resistance measuring device 3 is provided with magnetic force strip 31 and a plurality of marking magnets 32;The magnetic force strip 31 is fixedly installed on the back of the resistance measuring device 3;A plurality of marking magnets 32 are adsorbed on the front of the resistance measuring device 3 through the magnetic force strip 31. Using the resistance measuring device 3 can measure a plurality of different to-be-measured resistances, the customized resistance A is welded on the soldering plate 511, the red meter pen 621 and the black meter pen 622 are short-circuited, the position of 0Ω is determined, the marking magnet 32 is adhered to the resistance measuring device 3, and the position of the pointer at this moment is recorded, and 0 is recorded;The microammeter 512 and the different value of the external testing resistance element are connected in series through the red meter 621 and the black meter 622, the marking magnet 32 prepared in advance is adsorbed at the position indicated by the pointer at this moment, and the marking record is made.

[0038] The working principle of this embodiment is the same as that of embodiment 1. Embodiment 3

[0039] The difference from embodiment 2 is that the electrical element B52 comprises a power supply 53, a sliding resistance 54, a fixed resistance B55, a current meter 56 and an adjusting resistance 57; the power supply 53 comprises a power supply one 531 and a power supply two 532; the fixed resistance B55 comprises a fixed resistance one 551, a fixed resistance two 552, a fixed resistance three 553 and a fixed resistance four 554; the sliding resistance 54 comprises a sliding resistance one 541 and a sliding resistance two 542; the ohmmeter structure demonstration device 4 is provided with the current meter 56, the power supply one 531, the power supply two 532, the fixed resistance three 553 and the fixed resistance four 554 from left to right; the fixed resistance one 551 and the fixed resistance two 552 are installed below the current meter 56 from left to right; the sliding resistance one 541 is located directly below the power supply one 531; the sliding resistance two 542 is located directly below the power supply two 532; the adjusting resistance 57 is installed on one side of the sliding resistance two 542.

[0040] The ohmmeter structure demonstration device 4 is provided with six gears, A1, A2, A3, A4, A5 and A6 from left to right, which are adjusted by the black pen 622, the red pen 621 is connected with the current meter 56, and the red pen 621 and the black pen 622 are connected with the measured element; the A1 and A2 gears are current gears; the A3 and A4 gears are ohm gears; the A5 and A6 gears are voltage gears; when the black pen 622 is located at the A2, A3, A4, A5 and A6 gears, the fixed resistance one 551 and the fixed resistance two 552 are connected in series and connected in parallel with the current meter 56 to form

[0041] When the black pen 622 is located at the A1 gear, the current meter 56 is connected in series with the fixed resistance two 552, and then connected in parallel with the fixed resistance one 551 through the ordinary wire 61;

[0042] When the black pen 622 is located at the A2 gear, the fixed resistance one 551 and the fixed resistance two 552 are connected in series and connected in parallel with the current meter 56 to form

[0043] When the black pen 622 is located at the A3 gear; the power supply one 531 is connected in series with the sliding resistance one 541 through the ordinary wire 61;

[0044] When the black pen 622 is located at the A4 gear; the power supply one 531 is connected in series with the adjusting resistance 57 and the sliding resistance two 542 through the ordinary wire 61 in turn;

[0045] When the black pen 622 is in A5 gear, the fixed resistor three 553 is connected with the ammeter 56.

[0046] When the black pen 622 is in A6 gear, the fixed resistor three 553 and the fixed resistor four are connected in series through the common wire 61.

[0047] When the ohmmeter structure demonstration device 4 is used to measure current, the red pen 621 and the black pen 622 are connected with a small lamp, the small lamp is normally powered by a direct current power supply, the A1 gear is selected by the black pen 622, at this time, the ammeter 56 is connected in series with the fixed resistor two 552, and is connected in parallel with the fixed resistor one 551, the ammeter 56 is modified into a large-range ammeter, the ammeter is connected in series with the small lamp, and the current value passing through the small lamp can be read through the ammeter 56.

[0048] When measuring voltage, the red pen 621 and the black pen 622 are connected with a small lamp, the small lamp is normally powered by a direct current power supply, the A5 gear is selected by the black pen 622, the fixed resistor one 551 and the fixed resistor two 552 are connected in series, and are connected in parallel with the ammeter 56, and are modified into a small-range ammeter, at this time, the fixed resistor three 553 is connected, and is modified into a small-range voltmeter, the voltmeter is connected in series with the small lamp, and the voltage value can be read through the ammeter 56.

[0049] When measuring resistance, the A3 gear is selected by the black pen 622, the fixed resistor one 551 and the fixed resistor two 552 are connected in series, and are connected in parallel with the ammeter 56, and are modified into a small-range ammeter, at this time, a power supply one and a sliding resistor one are connected in series, and are modified into a large-range ohmmeter, the ohmmeter is connected in series with the resistance to be measured, and the resistance value can be read through the ammeter 56.

[0050] The working principle of the embodiment is the same as that of embodiment 2.

[0051] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing embodiments, or equivalent replacement is made to part of the technical features, any modification, equivalent replacement, improvement etc. made within the spirit and principle of the utility model, should be included in the protection scope of the utility model.

Claims

1. A teaching aid for exploring the distribution characteristics and principles of the resistance scale lines of an ohmmeter, characterized by: The invention comprises a bracket (1), a support plate (2), a resistance measuring device (3), an ohmmeter structure demonstration device (4), an electrical element (5) and a wire (6); the support plate (2) is fixedly mounted on the bracket (1); the resistance measuring device (3) and the ohmmeter structure demonstration device (4) are mounted on the support plate (2) from top to bottom; the electrical element (5) is provided with two groups, namely, an electrical element A (51) and an electrical element B (52); the electrical element A (51) is detachably mounted on the resistance measuring device (3); the electrical element B (52) is detachably mounted on the ohmmeter structure demonstration device (4); the wire (6) comprises an ordinary wire (61) and a red and black test lead (62); the ordinary wire (61) is used to connect the electrical element (5); the red and black test leads (62) comprise a red test lead (621) and a black test lead (622), which are used for the electrical element (5) to be externally connected to the test element.

2. The teaching aid for exploring the distribution characteristics and principles of the resistance scale lines of an ohmmeter according to claim 1, characterized in that: The electrical element A (51) includes a welding plate (511), a microammeter (512), and a dry battery (513); a custom resistor A is welded on the welding plate (511); the welding plate (511), the microammeter (512), and the dry battery (513) are sequentially connected via the common wire (61); and the red and black test leads (62) are respectively mounted on the welding plate (511) and the dry battery (513).

3. The teaching aid for exploring the distribution characteristics and principles of the resistance scale lines of an ohmmeter according to claim 2, characterized in that: The resistance measuring device (3) is provided with a magnetic strip (31) and a plurality of marking magnets (32); the magnetic strip (31) is fixedly mounted on the back of the resistance measuring device (3); and the plurality of marking magnets (32) are adsorbed on the front of the resistance measuring device (3) through the magnetic strip (31).

4. The teaching aid for exploring the distribution characteristics and principles of the resistance scale lines of an ohmmeter according to claim 1, characterized in that: The electrical element B (52) includes a power supply (53), a sliding resistor (54), a fixed resistor B (55), an ammeter (56) and an adjustment resistor (57); the power supply (53) includes a power supply 1 (531) and a power supply 2 (532); The fixed value resistor B (55) includes a fixed value resistor 1 (551), a fixed value resistor 2 (552), a fixed value resistor 3 (553) and a fixed value resistor 4 (554); The sliding resistor (54) includes a sliding resistor 1 (541) and a sliding resistor 2 (542); Above the ohmmeter structure demonstration device (4), from left to right, are the ammeter (56), power supply 1 (531), power supply 2 (532), fixed value resistor 3 (553) and fixed value resistor 4 (554); The fixed resistor 1 (551) and the fixed resistor 2 (552) are installed from left to right below the ammeter (56); the sliding resistor 1 (541) is located directly below the power supply 1 (531); the sliding resistor 2 (542) is located directly below the power supply 2 (532); and the adjustment resistor (57) is installed on one side of the sliding resistor 2 (542).

5. The teaching aid for exploring the distribution characteristics and principles of the resistance scale lines of an ohmmeter according to claim 4, characterized in that: The ohmmeter structure demonstration device (4) has six gears, which are A1, A2, A3, A4, A5, and A6 from left to right, and are adjusted by the black test lead (622). The red test lead (621) is connected to the ammeter (56), and the red test lead (621) and the black test lead (622) are external to the measured element; the A1 and A2 gears are current gears; the A3 and A4 gears are ohm gears; the A5 and A6 gears are voltage gears; when the black test lead (622) is in the A2, A3, A4, A5, and A6 gears, the fixed value resistor 1 (551) and the fixed value resistor 2 (552) are connected in series, and are connected in parallel with the ammeter (56); When the black test lead (622) is at the A1 position, the ammeter (56) is connected in series with the second fixed value resistor (552), and then connected in parallel with the first fixed value resistor (551) via the common wire (61); When the black test lead (622) is at the A2 gear position, the fixed value resistor 1 (551) and the fixed value resistor 2 (552) are connected in series and in parallel with the ammeter (56); When the black test lead (622) is at the A3 gear position, the power supply 1 (531) and the sliding resistor 1 (541) are connected in series via the common wire (61); When the black test lead (622) is at the A4 gear position, the power supply 1 (531), the regulating resistor (57), and the sliding resistor 2 (542) are sequentially connected in series via the common wire (61); When the black test lead (622) is at the A5 position, the fixed value resistor 3 (553) is connected to the ammeter (56); When the black test lead (622) is at the A6 gear position, the fixed value resistor three (553) and the fixed value resistor four are connected in series via the common wire (61).

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