what is the procedure of experiment of Anderson bridge?
Answers
Answer:
AC bridges are often used to measure the value of unknown impedance (self/mutual inductance of inductors or capacitance of capacitors accurately). A large number of AC bridges are available and Anderson's Bridge is an AC bridge used to measure self inductance of the coil. It is a modification of Wheatstones Bridge. It enables us to measure the inductance of a coil using capacitor and resistors and does not require repeated balancing of the bridge. The connections are shown in Fig: 1.
The bridge is balanced by a steady current by replacing the headphone H by moving coil galvanometer and A.C source by a battery. This is done by adjusting the variable resistance, r. After a steady balance has been obtained, inductive balance is obtained by using the A.C source and headphone.
The condition for balance is that the potentials at the terminals D and E are same. Then the current flowing through branch AB is I1, through branch AE and EB is I2. The current flowing through branches AD and DC is I3, while that through branch BC is I1+I2. No current flows through branch DE.
Explanation:
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Answer:
Explanation:
Procedure for doing simulator
1. Connections are made using the above connection diagram for wheatsons bridge and Anderson's bridge .
2. Power on the switch of siganal generator.
3. Apply pariticular Voltage and frequency.
4. Select particular length for inductance coil and diameter for core.
5. Give a particular resistance value for P resistance box and other value of resistances in Q, R and S will automatically appear.
6. The value of variable resistor 'r' can be varied either by using the slider or by clicking the arrow displayed in the resistor.
7. Note the value of r, where the voltage in CRO becomes zero is the balancing condition.
Note: The value of resistances in the four resistance boxes are suitable to attain balancing condition, the variable resistor, r will automatically display a value near the balancing condition. Otherwise variable resistor displays the minimum value of 1Ω.
8. The experiment is repeated by using " reset" button. Also we can hold the connections and can change the parameters by " Power off " button.
Procedure for real lab
Connections are made as shown in the theory. A.C. source say a 1000Hz audio-oscilloscope and a head set is used here. Keeping the value of P, Q, R and S constant, adjust the value of variable resiatnce r till the sound is reduced to a minimum value. This is the balancing point of the alternating current. Note the value of resistance r and capacitor C. Repeat the experiment three times and calculate the self inductance of the coil using equations.
Results
1. The self inductance (L) of a coil using Anderson's Bridge = H
2. The inductive reactance( XL) of the coil at a particular frequency of the given coil = Ω