CN203405998U - Experiment demonstration circuit for physics teaching - Google Patents
Experiment demonstration circuit for physics teaching Download PDFInfo
- Publication number
- CN203405998U CN203405998U CN201320557353.2U CN201320557353U CN203405998U CN 203405998 U CN203405998 U CN 203405998U CN 201320557353 U CN201320557353 U CN 201320557353U CN 203405998 U CN203405998 U CN 203405998U
- Authority
- CN
- China
- Prior art keywords
- circuit
- fuse
- physics teaching
- experiment
- demonstration circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Control Of Resistance Heating (AREA)
Abstract
The utility model relates to an experiment demonstration circuit for physics teaching. The experiment demonstration circuit for physics teaching comprises a parallel circuit, wherein a primary road of the parallel circuit is connected with a resistor, one branch is connected with a switch, and other branches are respectively connected with an electric appliance and a switch. The experiment demonstration circuit is characterized in that the primary road of the parallel circuit is further provided with a fuse and a 36V auto transformer connected with an alternating current power source, a diameter of the fuse is 0.5mm, length of the fuse is 25cm, and length of the resistor is 15cm, and a resistance value of the resistor is 3ohm. The experiment demonstration circuit is safe to operate, can reduce tension of students during an experiment and can change an instant fusing process of the fuse into a slow fusing process, so a demonstration process is more visual.
Description
Technical field
The utility model relates to physics teaching in secondary school device, particularly a kind of physics teaching experimental demonstration circuit.
Background technology
In Shanghai section version ninth grade physics textbook, providing two simple circuit diagrams to demonstrate at circuit is short-circuited or general power is excessive in the situation that, Fig. 1 and Fig. 2 between primary circuit figure mainly contain following deficiency in field research:
1,, in demonstration " effect of fuse " this when experiment, the electrical appliance of use, switch, fuse etc. are to be all connected on the power supply of 220 volts, test like this, have the danger of getting an electric shock.If forget, breaking circuit switch just changes fuse, be just easy to human body be connected in 220V circuit, occur dangerous.
2, fuse heating fusing is the process of a moment, and student has little time to observe, and the sound producing during fusing is large and too unexpected, and student easily produces terrified psychology, disperses attention of student, is unfavorable for concentrating on attending class.
3, the demo function of circuit board is simpler, and student is difficult for observing.
Summary of the invention
The purpose of this utility model is exactly in view of the foregoing defects the prior art has, provide a kind of simple in structure, observe physics teaching experimental demonstration circuit directly perceived, safety coefficient is high.
The technical solution of the utility model is: comprise a parallel circuit, contact resistance on the main line of described parallel circuit, connecting valve on one of them branch road, on all the other each branch roads, connect respectively electrical appliance and switch, it is characterized in that: on described main line, be also provided with fuse and the 36V autotransformer being connected with AC power; Described fuse is the fuse of diameter 0.5mm, length 25cm; Described resistance is length 15cm, the resistance wire in resistance value 3 Europe.
Such scheme further comprises:
Described resistance wire is the resistance wire of smearing alcohol rosin.
Described resistance wire is the heating wire using on electric furnace, and by the stretching doubling of heating wire and form rope made of hemp shape.
Described electrical appliance is the lathe bulb of rated voltage 36V, rated power 6W.
Compared with prior art, the beneficial effects of the utility model are:
L, safe operation process.This experiment is pressed as exchanging 36V by the transmission of electricity after autotransformer, is safe handling voltage, even if careless hot line job also can not threaten the safety of human body in experimentation.
2, the process of fuse moment fusing can be become to the slowly process of fusing.Connect successively the electrical appliance of each branch road, in can illustrative circuitry, thereby electric power progressively increases the electric current making by fuse and increases gradually, the heat that fuse produces increases gradually, there will be first deliquescing semiarc shape subsequently, then slowly blow such a visual in image progressive formation, be convenient to very much observation of students.
3, the scaring degree that lowers student, causes circuit fusing fuse by switch connection; Because what circuit was used is 36V voltage, the severe degree producing during the original use of this operation ratio 220V voltage reduces to some extent, reduces the frightened degree of student.
4, increased demo function.This experimental circuit can also compare the similarities and differences of fuse and general heating silk.When demonstration short circuit operation, connecting circuit fuse fuses, emerge a large amount of white cigarette but do not fuse of heating wire, illustrated that heating wire and fuse are all to be made by the large material of resistivity, but the high not fusing of the fusing point of heating wire, so fused and the fusing point of fuse is low, successful and directly perceived.
Accompanying drawing explanation
Fig. 1 is the connection diagram of existing short circuit current;
Fig. 2 is the connection diagram of the excessive circuit of total available power;
Fig. 3 is connection diagram of the present utility model.
Embodiment
By reference to the accompanying drawings, the utility model will be further described.
Referring to Fig. 1, a kind of physics teaching experimental demonstration circuit, comprise that it is the parallel circuit of 36V autotransformer that output voltage is installed, the fuse of diameter 0.5mm, length 25cm is installed between the main line A B of parallel circuit, between CD, connect a segment length 15cm, resistance value 3 Europe and be coated with alcohol rosin resistance wire, connecting valve K on one of them branch road, on its excess-three branch road, connecting respectively rated voltage is lathe bulb and the switch (being respectively K1 and L1, K2 and L2, K3 and L3) that 36V, rated power are 6W; Resistance wire method for making is: the heating wire using on 300w electric furnace is first coated to alcohol rosin solution (being that rosin is put into alcohol, after its fusing) thereon with writing brush, and by the stretching doubling of heating wire and form rope made of hemp shape.
When carrying out the excessive experiment of illustrative circuitry general power, alternating voltage output voltage after autotransformer of input 220V is 36V; By K switch 1, bulb L1 is first connected, when bulb L2, L3 are connected in turn by K switch 2, K3 again, in can illustrative circuitry, thereby electric power progressively increases the electric current making by fuse and increases gradually, the heat that fuse produces increases gradually, there will be first deliquescing semiarc shape subsequently, then slowly blow such a visual in image progressive formation, be convenient to very much observation of students.
When carrying out the experiment of illustrative circuitry short circuit, alternating voltage output voltage after single-circuit transformer of input 220V is 36V, and K switch is connected and caused circuit fusing fuse; Because what circuit was used is 36V voltage, the severe degree producing during the original use of this operation ratio 220V voltage reduces to some extent, reduces the frightened degree of student.
In addition this experimental circuit can also compare the similarities and differences of fuse and general heating silk, in prior art, between CD, in carrying out above-mentioned experimentation, be all to connect general wire, and the above-mentioned heating wire of coating rosin alcoholic solution is changed while carrying out this function presentation, K again closes a switch, bulb does not work, fuse fuses, emerge a large amount of white cigarette but do not fuse of heating wire, illustrated that heating wire and fuse are all to be made by the large material of resistivity, but the high not fusing of the fusing point of heating wire, so fused and the fusing point of fuse is low, successful and directly perceived.
Claims (4)
1. a physics teaching experimental demonstration circuit, comprise a parallel circuit, contact resistance on the main line of described parallel circuit, connecting valve on one of them branch road, on all the other each branch roads, connect respectively electrical appliance and switch, it is characterized in that: on described main line, be also provided with fuse and the 36V autotransformer being connected with AC power; Described fuse is the fuse of diameter 0.5mm, length 25cm; Described resistance is the resistance wire in length 15cm, resistance value 3 Europe.
2. physics teaching according to claim 1 experimental demonstration circuit, is characterized in that: described resistance wire is the resistance wire of smearing alcohol rosin.
3. physics teaching according to claim 1 and 2 experimental demonstration circuit, is characterized in that: described resistance wire is the heating wire using on electric furnace, and by the stretching doubling of heating wire and form rope made of hemp shape.
4. physics teaching according to claim 3 experimental demonstration circuit, is characterized in that: described electrical appliance is the lathe bulb of rated voltage 36v, rated power 6W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320557353.2U CN203405998U (en) | 2013-09-10 | 2013-09-10 | Experiment demonstration circuit for physics teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320557353.2U CN203405998U (en) | 2013-09-10 | 2013-09-10 | Experiment demonstration circuit for physics teaching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203405998U true CN203405998U (en) | 2014-01-22 |
Family
ID=49941922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320557353.2U Expired - Fee Related CN203405998U (en) | 2013-09-10 | 2013-09-10 | Experiment demonstration circuit for physics teaching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203405998U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106297510A (en) * | 2016-11-02 | 2017-01-04 | 中国石油大学胜利学院 | Relay protection based on 36V voltage and the portable simulator of secondary circuit |
-
2013
- 2013-09-10 CN CN201320557353.2U patent/CN203405998U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106297510A (en) * | 2016-11-02 | 2017-01-04 | 中国石油大学胜利学院 | Relay protection based on 36V voltage and the portable simulator of secondary circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203405998U (en) | Experiment demonstration circuit for physics teaching | |
| CN204375691U (en) | A kind of electricity Physical Experiment fuse | |
| CN204614317U (en) | Low-voltage circuit breaker teaching demonstration device | |
| CN202601042U (en) | Device for demonstrating harms caused by short circuit | |
| CN203673026U (en) | Misplaced partial discharge model for stress cone of 10kV-cable intermediate joint | |
| CN203503215U (en) | Multifunctional short circuit demonstration device | |
| CN206490864U (en) | LED illumination circuit | |
| CN204204289U (en) | The electric power experiment instrument improved | |
| CN204256115U (en) | A kind of thyristor checker | |
| CN204166768U (en) | Middle School Physics over load experimental demonstration device | |
| CN202126478U (en) | Fast detection device by cable quality contrast | |
| CN216133563U (en) | Short circuit harm presentation device | |
| CN202584520U (en) | High voltage discharging demonstration device | |
| CN203950479U (en) | A kind of power supply short circuit demonstration device | |
| CN203838935U (en) | Light control, magnetic control and temperature control circuit integrated experiment board for teaching | |
| CN205645053U (en) | Digital display joule law experimental apparatus | |
| CN204882846U (en) | High -low pressure electroscope tester | |
| CN204154794U (en) | Wire stripping surveys electric integrated instrument | |
| CN204516190U (en) | A kind of slide rheostat demonstrator | |
| CN202976622U (en) | A silicon controlled rectifier demonstration teaching tool | |
| CN207801067U (en) | A kind of electrical energy consumption analysis instrument simulation test circuit | |
| CN201707821U (en) | Demonstration experimental device for long/short distance power transmission | |
| CN214897200U (en) | Circuit overload and short circuit teaching demonstration device | |
| CN204130025U (en) | The reason that electric current is excessive and harm demonstration device thereof | |
| CN202333731U (en) | Alternating-current power-supply fault-displaying and illuminating power-distributing box |
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: 20140122 Termination date: 20140910 |
|
| EXPY | Termination of patent right or utility model |