Teaching demonstration instrument for relation between resistance and temperature in junior high school physics
By designing a teaching demonstration instrument for the relationship between physical resistance and temperature in junior high school, and using alcohol lamps to heat the small tungsten wire in parallel, the problem of unintuitive observation of resistance and temperature and safety hazards is solved, and the intuitive experimental experience and safe teaching of the whole class is realized.
Patent Information
- Application Number
- CN202421695006.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-07-17
AI Technical Summary
In junior high school physics teaching, the observation of the relationship between resistance and temperature is not intuitive, and the use of lighters has safety risks, making it difficult for the whole class to observe the experimental phenomenon at the same time.
A teaching demonstration instrument for physical resistance and temperature relationship between junior high school is designed. Electrical components are placed on wooden boards, tungsten wire is heated with alcohol lamps, and a string of lamps is connected in parallel through multiple small light bulbs, and a limit port is set on the foam board to fix the alcohol lamp to ensure safety and stability.
This enables the whole class to observe the relationship between resistance and temperature intuitively, with obvious experimental phenomena, high safety, simple structure, easy to reuse, and improves teaching effect.
Smart Images
Figure CN223296458U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of physics teaching, in particular to a teaching demonstration instrument for the relationship between resistance and temperature in junior high school physics. Background Art
[0002] Regarding the relationship between resistance and temperature, many junior high school physics teachers have students rely on rote memorization that "the higher the temperature of a metal conductor, the greater its resistance", lacking observation and summary of the phenomenon;
[0003] Some teachers use a small light bulb connected to a piece of metal wire and a power switch to form a basic circuit. They then use a lighter to heat the metal wire and observe the change in brightness of the small light bulb. However, most of these demonstrations are flat, and only a few students can go on stage to observe, resulting in low class participation. Furthermore, the brightness change of a small light bulb is weak and not very intuitive, so students in the back row cannot observe it. Furthermore, using a lighter poses a safety hazard, and there are also cases of non-standard classroom experimental operations.
[0004] Create a "Junior Middle School Physics Teaching Demonstration Instrument for the Relationship between Resistance and Temperature" to help teachers demonstrate in class so that all students can see the experimental phenomena clearly and understand and remember the relationship between resistance and temperature.
[0005] Through the experimental demonstration, students can analyze based on the conclusion that when the power is just turned on, the filament has not yet heated up significantly and its resistance is very small. At this time, the current is large, and a large amount of Joule heat is generated in a short period of time, causing the filament temperature to rise rapidly, which can easily burn out the bulb; in the experiment, when the voltage remains unchanged, the temperature of the bulb rises when it is working, the resistance increases, the actual power decreases, and therefore the brightness becomes lower. Utility Model Content
[0006] In view of the deficiencies of the existing technology, the utility model provides a teaching demonstration device for the relationship between resistance and temperature in junior high school physics, which solves the problems that the brightness change of a small light bulb is weak and not very intuitive, and students in the back row cannot observe it; and there are safety hazards when using a lighter.
[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a junior high school physics resistance and temperature relationship teaching demonstration instrument, including a wooden board, an incandescent lamp holder is fixedly installed on one side of the front of the wooden board, a tungsten filament is fixedly installed inside the incandescent lamp holder, a base is fixedly connected to the front of the wooden board and located below the incandescent lamp holder, an alcohol lamp is provided on the top of the base, a battery box is fixedly connected to the front of the wooden board and located on one side of the base, a plurality of batteries are fixedly installed inside the battery box, a switch is fixedly installed on the other side of the front of the battery, a plurality of small light bulbs are fixedly installed on the front of the wooden board and located between the incandescent lamp holder and the switch, and the plurality of small light bulbs are connected in parallel through copper core wires.
[0008] Preferably, a foam board is fixedly connected to the top of the base, and a limiting opening adapted to the alcohol lamp is opened on the top of the foam board.
[0009] Preferably, the incandescent lamp holder is connected to the battery box via a first circuit, and the battery box is connected to the switch via a second circuit.
[0010] Preferably, the switch is connected to the plurality of small bulbs via a first wire, and the plurality of small bulbs are connected to the incandescent lamp holder via a second wire.
[0011] Preferably, a placement seat is fixedly installed on the rear portion of the wooden board. Beneficial effects
[0012] The utility model provides a teaching demonstration device for the relationship between resistance and temperature in junior high school physics. Compared with the existing technology, it has the following advantages:
[0013] (1) This utility model places electrical components on a wooden board, which is convenient for the whole class to observe. It is safer to use an alcohol lamp to heat the tungsten filament. Eight small bulbs are connected in parallel to form a light string to facilitate observation of experimental phenomena. It has a simple structure, is easy to use, and has a high reusability rate. The experimental phenomenon is very obvious, allowing junior high school students to more intuitively understand that resistance is related to temperature.
[0014] (2) The utility model opens a limiting opening on the foam board and places the alcohol lamp in the limiting opening so that the limiting opening limits the position of the alcohol lamp, thereby ensuring the stability of the placement of the alcohol lamp. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the external structure of the utility model;
[0016] Figure 2 This is a structural diagram of the base, foam board and limit opening of the utility model;
[0017] Figure 3 It is a schematic diagram of the parallel structure of small light bulbs of the utility model.
[0018] In the picture: 1. Wooden board; 2. Incandescent lamp holder; 3. Tungsten filament; 4. Base; 5. Alcohol lamp; 6. Battery box; 7. Battery; 8. Switch; 9. Small light bulb; 10. Copper core wire; 11. Foam board; 12. Limiting opening; 13. Placement seat; 14. First circuit; 15. Second circuit; 16. First wire; 17. Second wire. DETAILED DESCRIPTION
[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0020] See also Figure 1-2 The utility model provides a technical solution: a teaching demonstration instrument for the relationship between resistance and temperature in junior high school physics, comprising a wooden board 1, an incandescent lamp holder 2 fixedly mounted on one side of the front of the wooden board 1, a tungsten filament 3 fixedly mounted inside the incandescent lamp holder 2, a base 4 fixedly connected to the front of the wooden board 1 and located below the incandescent lamp holder 2, an alcohol lamp 5 provided on the top of the base 4, a battery box 6 fixedly connected to the front of the wooden board 1 and located on one side of the base 4, a plurality of batteries 7 fixedly mounted inside the battery box 6, a switch 8 fixedly mounted on the other side of the front of the battery 7, a plurality of small light bulbs 9 fixedly mounted on the front of the wooden board 1 and located between the incandescent lamp holder 2 and the switch 8, such as Figure 3 As shown, several small bulbs 9 are connected in parallel via copper core wires 10 .
[0021] It should be noted that after the glass of the bulb on the incandescent lamp holder 2 is removed, tape can be wrapped around the edge to prevent accidental injury.
[0022] Furthermore, in order to limit the alcohol lamp 5 , a foam board 11 is fixedly connected to the top of the base 4 , and a limiting opening 12 adapted to the alcohol lamp 5 is opened on the top of the foam board 11 .
[0023] Furthermore, the incandescent lamp holder 2 and the battery box 6 are connected via a first line 14, the battery box 6 and the switch 8 are connected via a second line 15, the switch 8 and several small bulbs 9 are connected via a first wire 16, and the several small bulbs 9 and the incandescent lamp holder 2 are connected via a second wire 17.
[0024] Furthermore, in order to store it stably and flatly when not in use, a placement seat 13 is fixedly installed on the rear of the wooden board 1.
[0025] During use, by turning on the switch 8, the multiple batteries 7 supply power to the multiple small bulbs 9 through the second circuit 15 and the first wire 16, so that the multiple small bulbs 9 light up through the copper core wire 10, and then the alcohol lamp 5 is placed in the limit opening 12, and the alcohol lamp 5 is ignited. The burning flame of the alcohol lamp 5 heats the tungsten filament 3. The higher the temperature of the tungsten filament 3 is heated, it can be observed that the brightness of the multiple small bulbs 9 will decrease.
Claims
1. A teaching demonstration device for the relationship between resistance and temperature in junior high school physics, comprising a wooden board (1), characterized in that: An incandescent lamp holder (2) is fixedly mounted on one side of the front of the wooden board (1), a tungsten filament (3) is fixedly mounted inside the incandescent lamp holder (2), a base (4) is fixedly connected to the front of the wooden board (1) and located below the incandescent lamp holder (2), an alcohol lamp (5) is provided on the top of the base (4), a battery box (6) is fixedly connected to the front of the wooden board (1) and located on one side of the base (4), a plurality of batteries (7) are fixedly mounted inside the battery box (6), a switch (8) is fixedly mounted on the other side of the front of the battery (7), and a plurality of small light bulbs (9) are fixedly mounted on the front of the wooden board (1) and located between the incandescent lamp holder (2) and the switch (8).
2. The teaching demonstration device for the relationship between resistance and temperature in junior high school physics according to claim 1, characterized in that: A foam plate (11) is fixedly connected to the top of the base (4), and a limiting opening (12) adapted to the alcohol lamp (5) is provided on the top of the foam plate (11).
3. The teaching demonstration device for the relationship between resistance and temperature in junior high school physics according to claim 1, characterized in that: The incandescent lamp holder (2) and the battery box (6) are connected via a first line (14), and the battery box (6) and the switch (8) are connected via a second line (15).
4. The teaching demonstration device for the relationship between resistance and temperature in junior high school physics according to claim 1, characterized in that: The switch (8) is connected to the plurality of small bulbs (9) via a first wire (16), and the plurality of small bulbs (9) are connected to the incandescent lamp holder (2) via a second wire (17).
5. The teaching demonstration instrument for the relationship between resistance and temperature in junior high school physics according to claim 1, characterized in that: A placement seat (13) is fixedly mounted on the rear portion of the wooden board (1).
6. The teaching demonstration device for the relationship between resistance and temperature in junior high school physics according to claim 1, characterized in that: Several of the small light bulbs (9) are connected in parallel via copper core wires (10).