CN201207238Y - Demonstration instrument for metallic electric resistivity changing with temperature - Google Patents
Demonstration instrument for metallic electric resistivity changing with temperature Download PDFInfo
- Publication number
- CN201207238Y CN201207238Y CNU2008200016724U CN200820001672U CN201207238Y CN 201207238 Y CN201207238 Y CN 201207238Y CN U2008200016724 U CNU2008200016724 U CN U2008200016724U CN 200820001672 U CN200820001672 U CN 200820001672U CN 201207238 Y CN201207238 Y CN 201207238Y
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- temperature
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- resistivity
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Abstract
The utility model relates to a device for demonstrating the change of metallic resistivity with the temperature, which is suitable to be used as demonstration experiment in the class of middle school in order to make up the defect that an experimental device for demonstrating the change of metallic resistivity with the temperature is lacked. The device adopts a daylight lamp as a heating metal wire for experiment, and the daylight lamp is connected with a power supply, a key, a small bulb, and a sliding resistor by conductors in series so as to form a closed circuit, the filament of the daylight lamp is heated by fire so that the small bulb becomes dark, accordingly the resistance of the filament is increased as well as the resistivity is increased. The utility model has the biggest advantage that: materials easy to be obtained all around are utilized to make an experimental device so as to reach perfect teaching effect. The utility model has simple material selection, convenient operation and is valuable to be popularized.
Description
Affiliated technical field
The utility model relates to a kind ofly demonstrates that the metallic resistance rate varies with temperature and the device that changes is applicable in the classroom, middle school as lecture experiment.
Background technology
The law of resistance is a key content of senior middle school physics teaching, but the student can be almost nil with the experience of life that variation of temperature changes for the resistivity of metal, allow the student grasp this content conscientiously, the perceptual knowledge that demonstration by experiment increases them is very important.What the laboratory was equipped with at present does not almost have with the experimental facilities that variation of temperature changes about the metallic resistance rate, and utilizes common metal, because resistivity is obvious inadequately with the variation of temperature phenomenon, experiment effect is unsatisfactory.How to seek the comparatively desirable experiment material that can conveniently obtain again, making can obviously reflect the resistivity of metal with the experimental provision that variation of temperature changes, and is a good problem to study.
Summary of the invention
In order to fill up the experimental provision of the phenomenon that resistivity that the laboratory lacks the demonstration metal changes with variation of temperature, the material that the utility model utilization can conveniently be obtained at one's side, successfully demonstrate out the phenomenon that the metallic resistance rate changes with temperature, provide fabulous example to the perceptual knowledge of the law of resistance for increasing the student.
The concrete technical scheme of the utility model is: break waste and old fluorescent tube into pieces back and take out filament of fluorescent lamp, as the heating of metal silk of experiment.Filament of fluorescent lamp and power supply, telegraph key, miniature bulb, rheochord are connected into a closed-loop path with lead.Also can with each component positioning on the circuit demonstrator, make things convenient for student's the observation and the operation of experiment.During experimental demonstration, closed telegraph key UNICOM circuit is regulated rheochord and is made miniature bulb normally luminous, with fire heating filament of fluorescent lamp, will find the miniature bulb deepening, and the resistance that filament be described is in increase, and the resistivity that filament is described is in increase; After stopping heating, the luminosity of miniature bulb recovers again gradually, illustrates that the resistivity of temperature reduction filament reduces again gradually.
Great advantage of the present utility model is exactly to have utilized the material that can conveniently obtain at one's side, has made simple and practical experimental provision, reaches extraordinary teaching efficiency.It is simple, easy to operate that the utility model is drawn materials, and is worthy to be popularized very much.
Description of drawings
Below in conjunction with accompanying drawing and concrete experimental procedure the utility model is further specified.
Fig. 1 is an embodiment principle schematic of the present utility model.
1. filament of fluorescent lamp among the figure, 2. lead, 3. miniature bulb, 4. rheochord, 5. telegraph key, 6. power supply, 7. fire
Embodiment
Break waste and old fluorescent tube into pieces back and take out filament of fluorescent lamp (1), as the heating of metal silk of experiment.Filament of fluorescent lamp (1) and power supply (6), telegraph key (5), miniature bulb (3), rheochord (4) are connected into a closed-loop path with lead (2).Also can with each component positioning on the circuit demonstrator, make things convenient for student's the observation and the operation of experiment.
During experimental demonstration, closed telegraph key (5) UNICOM circuit is regulated rheochord (4) and is made miniature bulb (3) normally luminous, with fire (7) heating filament of fluorescent lamp (1), to find miniature bulb (3) deepening, illustrate that the resistance of filament (1) is increasing, illustrate that the resistivity of filament (1) is increasing; After stopping heating, the luminosity of miniature bulb (3) recovers again gradually, illustrates that the resistivity of temperature reduction filament (1) reduces again gradually.
For the visibility that increases experimental phenomena strengthens experiment effect, after stopping heating, can blow the cooling of quickening filament (1), or, accelerate the cooling of filament (1) with the sprayer water smoke of jetting with mouth, it will be appreciated that the brightness of miniature bulb (3) changes rapidly.
Claims (1)
1, a kind of metallic resistance rate varies with temperature demonstrator, it is characterized in that: waste and old fluorescent tube is broken the back into pieces and is taken out filament of fluorescent lamp, heating of metal silk as experiment is connected into a closed-loop path with filament of fluorescent lamp and power supply, telegraph key, miniature bulb, rheochord with lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200016724U CN201207238Y (en) | 2008-01-29 | 2008-01-29 | Demonstration instrument for metallic electric resistivity changing with temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200016724U CN201207238Y (en) | 2008-01-29 | 2008-01-29 | Demonstration instrument for metallic electric resistivity changing with temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201207238Y true CN201207238Y (en) | 2009-03-11 |
Family
ID=40466298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200016724U Expired - Fee Related CN201207238Y (en) | 2008-01-29 | 2008-01-29 | Demonstration instrument for metallic electric resistivity changing with temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201207238Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106781906A (en) * | 2015-11-23 | 2017-05-31 | 重庆尊来科技有限责任公司 | A kind of integrated-type conductance image education demonstrator |
-
2008
- 2008-01-29 CN CNU2008200016724U patent/CN201207238Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106781906A (en) * | 2015-11-23 | 2017-05-31 | 重庆尊来科技有限责任公司 | A kind of integrated-type conductance image education demonstrator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090311 Termination date: 20100129 |