CN202662201U - Temperature digital display Joule law demonstrator - Google Patents
Temperature digital display Joule law demonstrator Download PDFInfo
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- CN202662201U CN202662201U CN 201220345865 CN201220345865U CN202662201U CN 202662201 U CN202662201 U CN 202662201U CN 201220345865 CN201220345865 CN 201220345865 CN 201220345865 U CN201220345865 U CN 201220345865U CN 202662201 U CN202662201 U CN 202662201U
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- temperature
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Abstract
The utility model provides a temperature digital display Joule law demonstrator. The demonstrator comprises a base and a back plate vertically arranged on the base, wherein two resistor systems and temperature acquisition and display systems matched with the resistor systems are arranged on the back plate; two second binding posts are arranged on the back plate; and a second resistor is connected between the two second binding posts. The demonstrator has high visibility, high sensitivity and strong intuitiveness and can not only be used for teaching demonstration, but also can be used by the students to carry out group experiments to explore and observe the relationship between heat generated when current passes through a conductor and resistance, the relationship between the heat and current intensity and the relationship between the heat and conduction time; and the sensor technology is adopted to measure the temperature, thus saving the experiment time, improving the accuracy and enhancing the experiment effects.
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 Joule law demonstrator that a kind of degree of accuracy is high, visibility is large, highly sensitive, intuitive is strong 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: temperature digital-display type Joule law demonstrator, 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 the first resistance in the container body, and lid is provided with two the first binding posts that are connected with the first 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;
Described backboard is provided with two the second binding posts, is connected with the second resistance between two the second binding posts.
Adopt technique scheme, use power supply, switch, wire, reometer and the first binding post to be connected to form the closed-loop path, the first 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 the first resistance sends is shown.The electric current I that reometer tests out is definite value, the resistance of the first 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.
In when demonstration, also the second resistance and the first resistance serial or parallel connection of one group of resistor system wherein can be tested, test out one group of numerical value.The first resistance of another group resistor system also correspondence tests out one group of numerical value, these two groups of numerical value is compared, thereby allow the student more profoundly know from experience the intension of Joule law.
It is large to the utlity model has visibility, 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 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, temperature digital-display type Joule law demonstrator of the present utility model comprises base 1 and the vertical backboard 2 that is located on the base 1, and 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 the first resistance 5 in the container body 3, and lid 4 is provided with two the first binding posts 6 that are connected with the first 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 the first resistance 5 and the temperature sensor 7 of inner encapsulation.
(2), respectively the first 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 that 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 the first binding posts 6 to be connected to form the closed-loop path, 5 heatings of the first resistance, 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 the first resistance 5 sends by temperature digital-display screen 9.The electric current I that reometer tests out is definite value, the resistance of the first 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.
In when demonstration, also can use wire with the first binding post 6 and the second binding post 10 serial or parallel connections, namely the second resistance 11 is tested with the first resistance 5 serial or parallel connections of one group of resistor system wherein, tests out one group of numerical value.The first resistance 11 of another group resistor system also correspondence tests out one group of numerical value, these two groups of numerical value is compared, thereby allow the student more profoundly know from experience the intension of Joule law.
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 the first resistance in the container body, and lid is provided with two the first binding posts that are connected with the first 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;
Described backboard is provided with two the second binding posts, is connected with the second resistance between two the second binding posts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220345865 CN202662201U (en) | 2012-07-17 | 2012-07-17 | Temperature digital display Joule law demonstrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220345865 CN202662201U (en) | 2012-07-17 | 2012-07-17 | Temperature digital display Joule law demonstrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202662201U true CN202662201U (en) | 2013-01-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220345865 Expired - Fee Related CN202662201U (en) | 2012-07-17 | 2012-07-17 | Temperature digital display Joule law demonstrator |
Country Status (1)
| Country | Link |
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| CN (1) | CN202662201U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092955A (en) * | 2015-09-24 | 2015-11-25 | 武汉大学 | Novel power transmission line tower lightning indicator, preparation method and application thereof |
| RU2616442C1 (en) * | 2015-12-03 | 2017-04-14 | Альберт Петрович Ершов | Method for demonstrating joule's law in differential form |
| CN110660300A (en) * | 2019-11-12 | 2020-01-07 | 苏红 | Joule's law experiment demonstration instrument and experiment method |
-
2012
- 2012-07-17 CN CN 201220345865 patent/CN202662201U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092955A (en) * | 2015-09-24 | 2015-11-25 | 武汉大学 | Novel power transmission line tower lightning indicator, preparation method and application thereof |
| RU2616442C1 (en) * | 2015-12-03 | 2017-04-14 | Альберт Петрович Ершов | Method for demonstrating joule's law in differential form |
| CN110660300A (en) * | 2019-11-12 | 2020-01-07 | 苏红 | Joule's law experiment demonstration instrument and experiment method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130109 Termination date: 20140717 |
|
| EXPY | Termination of patent right or utility model |