CN2711835Y

CN2711835Y - Demonstration instrument for ac circuit property

Info

Publication number: CN2711835Y
Application number: CN 200420040684
Authority: CN
Inventors: 张桂林
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-05-20
Filing date: 2004-05-20
Publication date: 2005-07-20
Anticipated expiration: 2014-05-20

Abstract

The demonstration instrument for ac circuit property provided by the utility model is the effectively and greatly improved demonstration instrument for the ac circuit property. A double-knife double-throw switch is fixed on an insulating panel, two ends of the double-knife double-throw switch are connected with the ac and dc circuits and connected with the circuit which is respectively connected in series with a parallel capacitor, a resistor, an inductance and a lamp. When the double-knife double-throw switch switches to the direct current end, the lamp of the inductance connected in series is the lightest, and the lamp of the capacitor connected in series is closed; when the double-knife double-throw switch switches to the alternating circuit end, the lamp of the inductance connected in series is the darkest, and the lamp of the capacitor connected in series is the lightest; when the frequency of the alternating current is increased, the lamp of the capacitor connected in series is the lightest and the lamp of the inductance connected in series is darker. The utility model has simple structure, convenient production, low cost and obvious demonstration effect.

Description

The alternating current circuit characteristic demonstrating instrument

One, technical field:

The alternating current circuit characteristic demonstrating instrument that the utility model provides is a kind of bigger improved instruments used for education that have.

Two, background technology:

In the current high school physics textbook in " inductance and electric capacity are to the influence of exchange current " one joint, be to observe bulb brightness and illustrate that inductance is by switch on the respectively sense, electric capacity of direct current, alternating current: " perfectly straight stream, resistance exchanges, logical low frequency hinders high frequency ".Electric capacity is: " stopping direct current, logical interchange, logical high frequency, resistance paper are frequently ".And present alternating current characteristic demonstrating device is the phase relation of demonstration exchange current voltage and electric current during by inductance, resistance, electric capacity, and is not inconsistent with teaching material, can't use in the middle school teaching.

Three, utility model content:

The purpose of this utility model is for consistent with the textbook content, is to make the student be convenient to study, grasps inductance, the inhibition of electric capacity to exchanging, and promptly inductance is " perfectly straight stream; resistance exchanges, logical low frequency, a resistance high frequency ", and electric capacity is " the logical interchange; stopping direct current, logical high frequency, resistance low frequency ".

The purpose of this utility model is achieved in that fixes a 10V D.C. voltmeter on the insulcrete DC circuit, fix a 10V A.C. voltmeter on the alternating circuit, two circuit connect the two ends of a double-point double-throw switch respectively, connect electric capacity, bulb, single-pole switch resistance in series, bulb, single-pole switch series connection then respectively, three road circuit parallel connections of connecting of inductance, bulb, single-pole switch.DC circuit and alternating circuit connect 6V direct current and AC frequency conversion power supply respectively, and double-point double-throw switch is thrown to the direct current direction, singly throw the hilted broadsword closure for three, see that the bulb that crosstalk is held does not work, and the lamp of crosstalk resistance is darker, and the bulb of crosstalk sense is bright especially.When double-point double-throw switch was thrown to alternating current one side, the bulb that crosstalk is held was the brightest, and the bulb of crosstalk resistance is darker, and crosstalk sense bulb is the darkest.When increasing the frequency of exchange current, the lamp that crosstalk is held is brighter, and the brightness of crosstalk resistance bulb is constant, and the bulb of crosstalk sense is darker.

Advantage of the present utility model is as follows:

1, simple in structure, science, reasonable, easily manufactured cost are low.

2, the demonstration effect is consistent with textbook, is convenient to the student and receives and grasp, and the demonstration effect is obvious.

Four, description of drawings

Fig. 1 is circuit theory diagrams of the present utility model.

Details are as follows in conjunction with the accompanying drawings for working condition of the present utility model:

Wherein 1 represents insulcrete, 2 expressions exchange binding post C, D, 3 expression direct current binding post A, B, 4 expression 10V D.C. voltmeters, 5 expression double-point double-throw switchs, 6,7,8 represent three 6V bulbs respectively, 9 expression telefaults, 10,12,13 represent three single-pole switches respectively, 11 expression resistors, 14 expression capacitors, 15 expression A.C. voltmeters.

Five, embodiment

3,2 direct supply and the AC frequency conversion power supplys that meet 6V respectively among the figure.Dpdt double-pole double-throw (DPDT) is held closure to a, b, closed single-

pole switch

10,12,13 of while, at this moment bulb 6 does not work, and bulb 7 is darker, and bulb 8 is bright especially, illustrates that direct current can not pass through capacitor, the electric capacity stopping direct current, perfectly straight stream of inductance and inhibition are very little.Then double-point double-throw switch is thrown the end to c, d, at this moment bulb 6 is the brightest, bulb 7 dark and during with perfectly straight stream brightness identical, bulb 8 is the darkest, illustrate that electric capacity is logical to exchange, inductance hinders interchange.Increase the frequency of exchange current, find that bulb 6 is brighter, bulb 7 brightness are constant, and bulb 8 is darker, illustrate that electric capacity leads to high frequency, resistance low frequency, and inductance leads to low frequency, resistance high frequency.By above lecture experiment the student is summed up: inductance is " a perfectly straight stream, resistance exchanges, logical low frequency, resistance high frequency ", and electric capacity is " the logical interchange, stopping direct current, logical low-and high-frequency, resistance low frequency ".To reach the purpose that the student receives and grasp inductance, electric capacity act in circuit.

Claims

1, alternating current circuit characteristic demonstrating instrument is characterized in that fixing a double-point double-throw switch on an insulcrete and upper and lower end connects the AC and DC circuit respectively, then double-point double-throw switch is connect the circuit that shunt capacitance, resistance, inductance are connected with bulb separately.