CN200990161Y - Multiple-aspect self-induction phenomenon demonstration instrument - Google Patents

Abstract

The utility model is composed of an inductive winding L, a small light bulb C, a current detector G, a buzzer Y1, a buzzer Y2, a voltage regulating diode D, a light emitting diode LED1, a light emitting diode LED 2, a comparison resistance R1, a trimmer resistance R2 and a switch K, etc. A circuit system which independently demonstrates self inducting phenomenon is formed on the circuit structure. The demonstrating of the experiment is obvious and intuitive; the two electrifying and outage self inducting phenomena can be demonstrated just by opening and closing on a circuit. The experiment has good continuity to make the student is easily understand. The utility model adopts a big size demonstrating ammeter J0401 to do demonstration in the class, having big visibility and largely satisfying the requirement of demonstration in the class, is an ideal educating instrument. The instrument can satisfy the using of the disabled students who have some facial defects.

Description

Multi-faceted self inductance demonstrator

Technical field

The utility model belongs to the physical electromagnetic instruments used for education, is a kind of special-purpose experimental facilities of demonstration self inductance.

Background technology

The self inductance lecture experiment is that Physical Education Teacher pay close attention to always and is difficult to the satisfied problem that solves, a lot of relevant personnel have spent a large amount of time to do a lot of research work for this reason, but do not see still that up to now the instrument that more satisfactory this respect is arranged comes out.About the self-induction experimental demonstration device, domestic relevant magazine was published the article of many this respects.Chinese patent CN87207333,00243185,90200694 has introduced achievement in research separately respectively, they all respectively have characteristics, two its these circuit of the conduct demonstration self inductance of quoting with present high school physics textbook are compared all progress in various degree, but it is exactly the shade that all be unable to do without above-mentioned two basic circuits that common place is all arranged, on circuit structure, form the separate component circuit system of demonstration self inductance, all relies on the different phenomenons that reflect in the moment of switching on resistance branch and inductive branch and make comparisons the existence of self inductance is described indirectly.We need make comparisons with inductive circuit and resistance circuit in experimental implementation, but we think the self inductance circuit establish one's own system prerequisite under carry out this comparative effectiveness can be better, more can intuitively reflect the true colours of self inductance, the student is more readily understood self inductance.

The purpose of this utility model provide a kind of can overcome the deficiencies in the prior art, circuit structure simple, make easily, easy and simple to handle, experimental demonstration obviously, directly perceived, can satisfy the self inductance demonstration instrument of the needs of imparting knowledge to students.

Summary of the invention

The utility model is by telefault L, load (miniature bulb) C, current detector G, hummer Y ₁, Y ₂, voltage stabilizing diode D, LED ₁, LED ₂, comparison resistance R ₁, trimmer resistor R ₂Reach element formations such as K switch, shown in figure one.Principle is like this: when moment that circuit is connected because the self-induction action of telefault L, current potential on the tie point A of voltage stabilizing diode D and telefault L and power supply potential U ₁Equate the breakdown immediately conducting of voltage stabilizing diode D, then have electric current to flow to negative terminal current detector pointer to the certain scale of clockwise direction deflection, make simultaneously and the identical LED of self inductance current direction of switching on from the anode of current detector G ₁Glisten, make hummer Y ₁Send the sound of " toot---", follow into the curve state that shown in figure two, tends towards stability that down lands gradually, when blink, the t afterpotential dropped to voltage stabilizing value less than diode D, D recovers normally, current detector G pointer gets back to 0, when having shown energising self inductance current to the side, reach steady state (SS) U at last ₂, the specified voltage stabilizing value V of voltage stabilizing diode D _SurelyJust be selected in slightly than A point stationary value U ₂Slightly height a bit, after this current potential is stable, not puncture voltage stabilizing diode D just for well.When K switch in the moment that disconnects, also because the effect of self-induction electromotive force, then have electric current to flow to the anode pointer by 0 rapidly to the certain scale of counter clockwise direction deflection from the negative terminal of G, make the luminotron LED identical simultaneously with the self-inductance power direction of current ₂Glisten, make hummer Y ₂Send the sound of " pout---", the back is recovered normal G pointer and is got back to 0, the direction of self inductance current when having shown outage with the stabilivolt D that reduces gradually of self inductance current.

For different these circuit that inductive circuit and resistance circuit are described ad hoc comparison resistance R ₁, during demonstration plug from the jack that connects with telefault extract be inserted in jack that resistance connects repeat above operation then and just can see that two circuit have difference in essence.

The utility model has the advantages that: experimental demonstration obviously, directly perceived, on a circuit once opening, one closing and can demonstrate the electric two kinds of self inductances of switching respectively.Not only can observe variable condition and the whole variation process that the direction of two self inductance currents can also be observed these two electric currents by instrument.The experiment continuity understands the student well easily.(280mm * 280mm) make class demonstration satisfies the needs in the teaching greatly with the J0401 demonstration ammeter.In the experimental demonstration process, can make the student from multi-faceted existence that perceives self inductance such as the swing of flash of light, sound, meter pointer and swaying directions.Band is interesting, can motivate students' interest in learning to some extent.What is particularly worth mentioning is that it is particularly suitable for some disabled students that the face defective is arranged and uses.

This instrument is not high to the various parameter requests of telefault, as long as satisfy L/R 〉=0.03, can use more than the inductance value 0.5H, also the sense formula ballast resistor of available 20W～40W replaces under less demanding situation.

Description of drawings

Figure one, be the utility model circuit theory diagrams.

Figure two, for the energising moment tie point A the voltage change process synoptic diagram.

Embodiment

Example: the used telefault of the utility model is that the enameled wire with line footpath Φ 0.68 is made into around 1000 circles on the iron core of 22cm * 3.5cm, current detector G is the J0401 demonstration ammeter, promptly remove parallel resistance and go here and there the potentiometer of a last 3K～5K in addition and make the amplitude of accommodation and use for demonstration needs to change a little, miniature bulb C is 6.3V/0.15A, stabilivolt D voltage stabilizing value is 5V, comparison resistance R ₁Be that 50 Ω/3W is adjustable, one of LED is a ruddiness another blue light, two sound frequency differences of hummer Y (can listen to draw and have any different), and K is general toggle switch.

Above element is not as long as well need big adjustment to use basically according to circuit theory diagrams one connection, but problem deserving of attention is at power supply U ₁Selection on must be fit to stabilivolt D voltage stabilizing value V _SurelyParameter otherwise effect is bad.Be semifixed resistor R in addition ₂Make amplitude of fluctuation and the luminance brightness of luminotron, the sound size of hummer of current detector G pointer make it to take into account mutually on transferring in position.During demonstration, only need stir K switch, one open, one close and to realize above said various demonstration effects.

Claims (3)

1, multi-faceted self inductance demonstrator comprises telefault L, miniature bulb C, current detector G, hummer Y ₁, Y ₂, voltage stabilizing diode D, LED ₁, LED ₂, comparison resistance R ₁, semifixed resistor R ₂And K switch, it is characterized in that: LED ₁, LED ₂With hummer Y ₁, Y ₂, be connected into parallel form respectively, and then in parallel with current detector G, telefault L; The anode of voltage stabilizing diode D and hummer Y ₁, Y ₂, LED ₁, LED ₂, semifixed resistor R ₂Connect negative terminal and telefault L, comparison resistance R ₁, miniature bulb C connects.

2, claims 1 described multi-faceted self inductance demonstrator is characterized in that: comparison resistance R ₁With the other end of telefault L, be connected with two banana jacks respectively, do demonstration relatively by the banana plug conversion during use.

3, claims 1 described multi-faceted self inductance demonstrator is characterized in that: current detector G and semifixed resistor R ₂Connect.

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