CN102542884A - Teaching device for demonstrating light sensitive characteristic - Google Patents
Teaching device for demonstrating light sensitive characteristic Download PDFInfo
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- CN102542884A CN102542884A CN2010106200060A CN201010620006A CN102542884A CN 102542884 A CN102542884 A CN 102542884A CN 2010106200060 A CN2010106200060 A CN 2010106200060A CN 201010620006 A CN201010620006 A CN 201010620006A CN 102542884 A CN102542884 A CN 102542884A
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- photoresistance
- light sensitive
- sensitive characteristic
- resistance
- teaching
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Abstract
The invention relates to a teaching device for demonstrating a light sensitive characteristic, which relates to the technical field of teaching experiment devices and is used for solving the technical problem of how to improving the teaching quality. The device comprises a light resistor, an ohm gauge and an incandescent bulb, wherein the light resistor is connected in series with the ohm gauge; and the incandescent bulb is connected to a power supply through a trimmer potentiometer. The device provided by the invention is suitable for physical teaching.
Description
Technical field
The present invention relates to the technology of experiment device for teaching, particularly relate to a kind of technology that is used to demonstrate the instructional device of light sensitive characteristic.
Background technology
All be provided with physics lesson in the present middle school, the teacher often need teach physical knowledge to the student with the method for visual illustration in physical teaching course, so that the student can better grasp and understand physical knowledge, improves teaching quality.
But, at present also do not have to demonstrate the instructional device of light sensitive characteristic, so the Physical Education Teacher can only give lessons when the physical knowledge of professor's light sensitive characteristic with written mode, this mode of giving lessons is second-rate, is not easy to the student and grasps knowledge.
Summary of the invention
To the defective that exists in the above-mentioned prior art, technical matters to be solved by this invention provides a kind of instructional device that is used to demonstrate light sensitive characteristic that can improve the physics teaching teaching quality through the visual illustration mode.
In order to solve the problems of the technologies described above, a kind of instructional device that is used to demonstrate light sensitive characteristic provided by the present invention is characterized in that: comprise a photoresistance, an ohmmeter, an incandescent lamp bulb;
Said photoresistance is connected in series with ohmmeter, and said incandescent lamp bulb is connected to power supply through a trimmer potentiometer.
Further, the resistance in the dark of said photoresistance is more than or equal to 0.1M Ω.
Further, the bright resistance of said photoresistance is smaller or equal to 1K Ω.
The instructional device that is used to demonstrate light sensitive characteristic provided by the invention; Utilize incandescent lamp bulb and trimmer potentiometer to regulate and shine the intensity of illumination in photoresistance; The resistance of photoresistance is changed with light, and show the change in resistance situation of photoresistance in real time through ohmmeter, this visual illustration mode cooperates the teacher to explain; Help the physical knowledge that the student grasps light sensitive characteristic, can improve the physics teaching teaching quality.
Description of drawings
Fig. 1 is the circuit diagram of instructional device that is used to demonstrate light sensitive characteristic of the embodiment of the invention.
Embodiment
Below in conjunction with description of drawings embodiments of the invention are described in further detail, but present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar variation thereof all should be listed protection scope of the present invention in.
A kind of instructional device that is used to demonstrate light sensitive characteristic as shown in Figure 1, that the embodiment of the invention provided is characterized in that: comprise a photoresistance R1, an ohmmeter B1, an incandescent lamp bulb L1;
Said photoresistance R1 is connected in series with ohmmeter B1, and said incandescent lamp bulb L1 is connected to power supply through a trimmer potentiometer R2.
In the embodiment of the invention, the model of said photoresistance is MG41-21, and its resistance in the dark is more than or equal to 0.1M Ω, and its bright resistance is smaller or equal to 1K Ω.
When the embodiment of the invention is carried out teaching demonstration, earlier incandescent lamp bulb is placed the photoresistance top, and trimmer potentiometer is transferred to its resistance reach valley; This moment, the brightness of incandescent lamp bulb reached the brightest, and under the irradiate light of incandescent lamp bulb, the resistance of photoresistance is near 1K Ω; The pointer of ohmmeter also rests near 1K Ω scale value place, then the resistance of trimmer potentiometer is slowly regulated towards the peak value direction, makes incandescent lamp bulb deepening gradually; Along with the deepening gradually of incandescent lamp bulb, the resistance of photoresistance also progressively increases, and the pointer of ohmmeter also moves towards 0.1M Ω scale value direction thereupon; When the resistance of trimmer potentiometer is adjusted to when reaching peak value; The brightness of incandescent lamp bulb reaches the most secretly (approaching to extinguish), and the resistance of photoresistance this moment is near 0.1M Ω, and the pointer of ohmmeter also rests near 0.1M Ω scale value place.
The principle of work of the embodiment of the invention is following:
Photoresistance is to adopt semi-conducting material manufacturing, utilizes the photovalve of inner photoeffect work.Its its resistance under the effect of light often diminishes, and this phenomenon is called photoconductive effect, and therefore, photoconductive tube is claimed in photoresistance again.In dark surrounds, its resistance value is very high, when receiving illumination; As long as photon energy is greater than the energy gap of semiconductor material; Then can transit to conduction band behind the energy of a photon of the Electron absorption in the valence band, and in valence band, produce a positively charged hole, this electron-hole pair that is produced by illumination has increased the number of charge carrier in the semiconductor material; Its resistivity is diminished, thereby cause the photoresistance resistance to descend.Illumination is stronger, and resistance is lower.After incident light disappears, will be compound gradually by the electron-hole pair that photon excitation produces, the resistance of photoresistance be also just recovered initial value gradually.
Claims (3)
1. an instructional device that is used to demonstrate light sensitive characteristic is characterized in that: comprise a photoresistance, an ohmmeter, an incandescent lamp bulb;
Said photoresistance is connected in series with ohmmeter, and said incandescent lamp bulb is connected to power supply through a trimmer potentiometer.
2. device according to claim 1 is characterized in that: the resistance in the dark of said photoresistance is more than or equal to 0.1M Ω.
3. device according to claim 1 is characterized in that: the bright resistance of said photoresistance is smaller or equal to 1K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106200060A CN102542884A (en) | 2010-12-28 | 2010-12-28 | Teaching device for demonstrating light sensitive characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106200060A CN102542884A (en) | 2010-12-28 | 2010-12-28 | Teaching device for demonstrating light sensitive characteristic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102542884A true CN102542884A (en) | 2012-07-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010106200060A Pending CN102542884A (en) | 2010-12-28 | 2010-12-28 | Teaching device for demonstrating light sensitive characteristic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102542884A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111028642A (en) * | 2019-12-19 | 2020-04-17 | 方凌花 | Teaching mould for electrochemiluminescence effect |
-
2010
- 2010-12-28 CN CN2010106200060A patent/CN102542884A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111028642A (en) * | 2019-12-19 | 2020-04-17 | 方凌花 | Teaching mould for electrochemiluminescence effect |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120704 |