CN202662203U - Temperature digital displaying type Joule law demonstrating device - Google Patents
Temperature digital displaying type Joule law demonstrating device Download PDFInfo
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- CN202662203U CN202662203U CN 201220345888 CN201220345888U CN202662203U CN 202662203 U CN202662203 U CN 202662203U CN 201220345888 CN201220345888 CN 201220345888 CN 201220345888 U CN201220345888 U CN 201220345888U CN 202662203 U CN202662203 U CN 202662203U
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- resistor
- microprocessor
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Abstract
A temperature digital displaying type Joule law demonstrating device comprises a base and a back plate vertically arranged on the base. Two groups of resistor systems and temperature acquiring display systems matched with the resistor systems are arranged on the back plate. Each group of resistor systems comprises a container body made of a transparent material, a cover body arranged at the top of the container body and in sealing connection with the container body and a resistor arranged in the container body, and two binding posts connected with the resistor are arranged on the cover body. Each temperature acquiring display system comprises a temperature sensor, a microprocessor and a temperature digital display screen, wherein the temperature sensor is arranged in the container body and is connected with the signal input end of the microprocessor, and the temperature digital display screen is arranged at the upper portion of the back plate and connected with the signal output end of the microprocessor. The temperature digital displaying type Joule law demonstrating device is large in visibility, high in sensitivity and strong in intuitiveness, can be used for teaching demonstration and grouping experiments of students, saves the experiment time, improves the accuracy degree and strengthens the experiment effect.
Description
Technical field
The utility model relates to a kind of instruments used for education, particularly a kind of temperature digital-display type Joule law demonstrator.
Background technology
Propose in newly organized compulsory education Physics Course standard (in February, 2012 promulgation): " by experiment, probe into and understand Joule law ", the Joule Law Experiment device is the key that ensures Success in Experiment.Existing teaching demonstration uses resistance wire energising heating kerosene, measures temperature by mercury thermometer, probes into Joule law, and holding time is oversize, is unsuitable for classroom teaching in middle school; Afterwards with the air in the resistance wire energising heating closed container, the air volumetric expansion of being heated, the fluid column that promotes in the U-shaped pipe raises, and relatively the expanded by heating size is probed into Joule law, this experimental apparatus holding time is short, help the classroom instruction experiment, still, relatively the expanded by heating size is a kind of indirect qualitative experiment, do not have the direct feeling temperature, have that error is large, visibility is little, sensitivity is low and defective not too intuitively.
The utility model content
The utility model provides the temperature digital-display type that a kind of degree of accuracy is high, visibility is large, highly sensitive, intuitive is strong Joule law demonstrator in order to solve weak point of the prior art.
For solving the problems of the technologies described above, the utility model adopts following technical scheme: comprise base and the vertical backboard that is located on the base, backboard be provided with two groups of resistor systems and with the temperature acquisition display system of resistor system support;
Described every group of resistor system include the container body made by transparent material, be located at the container body top and the lid that is tightly connected with container body and be located at resistance in the container body, and lid is provided with two binding posts that are connected with resistance;
Described temperature acquisition display system comprises temperature sensor, microprocessor and temperature digital-display screen, temperature sensor is located in the container body and with the signal input part of microprocessor and is connected, and the temperature digital-display screen is located at backboard top and is connected with the signal output part of microprocessor.
Adopt technique scheme, use power supply, switch, wire, reometer and binding post to be connected to form the closed-loop path, resistance heating, temperature raises in the container body, temperature sensor is transferred to microprocessor with the temperature signal that collects, and microprocessor is converted into digital signal with temperature signal and by the temperature digital-display screen display heat Q that resistance sends is shown.The electric current I that reometer tests out is definite value, the resistance of resistance is also known, record the size of a Q second every a period of time t, according to these numerical value, can calculate heat Q=I2Rt, thereby the demonstration with probe into out Joule law, can compare all lecture experiments of electrical conductor liberated heat relevant with strength of current, resistance and conduction time (Q=I2Rt).And change different power supplys, the size that namely changes electric current I is tested again.
The utlity model has visibility large, highly sensitive, intuitive is strong, not only can be used for teaching demonstration, also can be used for the student and carry out grouping experiment, probe into the relation of observing heat that electric current produces by conductor and resistance, probe into the relation of observing heat that electric current produces by conductor and strength of current, probe into the observation electric current by the heat of conductor generation and the relation of conduction time; Owing to having adopted sensor technology to measure temperature, saved experimental period, improved degree of accuracy, strengthened experiment effect.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Embodiment
As shown in Figure 1, a kind of temperature digital-display type Joule law demonstrator of the present utility model, comprise base 1 and the vertical backboard 2 that is located on the base 1, backboard 2 is provided with two groups resistor system and organizes two groups of temperature acquisition display systems of resistor system support with each;
Every group of resistor system include the container body 3 made by transparent material, be located at container body 3 tops and the lid 4 that is tightly connected with container body 3 and be located at resistance 5 in the container body 3, and lid 4 is provided with two binding posts 6 that are connected with resistance 5.
Every group of temperature acquisition display system includes temperature sensor 7, microprocessor 8 and temperature digital-display screen 9, temperature sensor 7 is located in the container body 3 and with the signal input part of microprocessor 8 and is connected, and temperature digital-display screen 9 is located at backboard 2 tops and is connected with the signal output part of microprocessor 8;
(1), the closed container transparent material manufacturing that forms of container body 3 and lid 4, can observe resistance 5 and the temperature sensor 7 of inner encapsulation.
(2), respectively the resistance 5(resistance that is encapsulated in two container bodies 3 is respectively 10 Ω, 5 Ω) should be wire wound resistor or resistance wire, be welded on the binding post lower end, be fixed on the lid 4;
(3), the temperature sensors 7 that are encapsulated in the container body 3 are the directly-heated type negative temperature coefficient thermistor, in temperature was 15 ℃～35 ℃ scopes, the resistance of thermistor varies with temperature should unidirectional significant change.The lead end of thermal resistor is fixed on the lid 4 and with microprocessor 8 and is connected.
(4), microprocessor 8(CPU) operating voltage is DC 6V, maximum operating currenbt is not more than 50mA, the information that should be able to temperature sensor 7 gathers, and convert thereof into temperature variation and show, display resolution is 0.1 ℃, the error of demonstration is not more than ± 1 ℃.
(5), temperature digital-display screen 9 adopts three bit digital semiconductors, the bits per inch word size is not less than 20mm * 28mm
(6), two closed containers work alone separately, conduction time is different, size of current is different, the heat that produces (temperature risings) is difference also.
When demonstrating or test, use power supply, switch, wire, reometer and two binding posts 6 to be connected to form the closed-loop path, resistance 5 heatings, container body 3 interior temperature raise, temperature sensor 7 is transferred to microprocessor 8 with the temperature signal that collects, and microprocessor 8 is converted into digital signal with temperature signal and demonstrates the heat Q that resistance 5 sends by temperature digital-display screen 9.The electric current I that reometer tests out is definite value, the resistance of resistance 5 is also known, record the size of a Q second every a period of time t, according to these numerical value, can calculate heat Q=I2Rt, thereby the demonstration with probe into out Joule law, can compare all lecture experiments of electrical conductor liberated heat relevant with strength of current, resistance and conduction time (Q=I2Rt).And change different power supplys, the size that namely changes electric current I is tested again.
Claims (1)
1. temperature digital-display type Joule law demonstrator is characterized in that: comprise base and the vertical backboard that is located on the base, backboard be provided with two groups of resistor systems and with the temperature acquisition display system of resistor system support;
Described every group of resistor system include the container body made by transparent material, be located at the container body top and the lid that is tightly connected with container body and be located at resistance in the container body, and lid is provided with two binding posts that are connected with resistance;
Described temperature acquisition display system comprises temperature sensor, microprocessor and temperature digital-display screen, temperature sensor is located in the container body and with the signal input part of microprocessor and is connected, and the temperature digital-display screen is located at backboard top and is connected with the signal output part of microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220345888 CN202662203U (en) | 2012-07-17 | 2012-07-17 | Temperature digital displaying type Joule law demonstrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220345888 CN202662203U (en) | 2012-07-17 | 2012-07-17 | Temperature digital displaying type Joule law demonstrating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202662203U true CN202662203U (en) | 2013-01-09 |
Family
ID=47457091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220345888 Expired - Fee Related CN202662203U (en) | 2012-07-17 | 2012-07-17 | Temperature digital displaying type Joule law demonstrating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202662203U (en) |
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2012
- 2012-07-17 CN CN 201220345888 patent/CN202662203U/en not_active Expired - Fee Related
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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: 20130109 Termination date: 20130717 |