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By measuring the voltage V across resistor R, current I in the circuit can be determined.
Measure V
1
, V
2
, and V to determine L and r using equations (2) to (6).
Procedure:
1. Connect the RL circuit to the oscillator using the given resistor and inductor coil
(Fig. 1).
2. Set the oscillator frequency to 2 KHz and set the voltage amplitude in the oscillator such
that the voltage drop across the inductor does not exceed certain Volts (… .).
3. Measure the voltage drops V
1
, V
2
and V for different values of R (Table 1).
4. Repeat the experiment by inserting an iron rod into the inductor coil.
From eq (2) to eq (6) calculate the inductance L and resistance r of the coil for air core
and iron core and plot them as a function of current in the circuit.
Table1
Sl No.
R(ohms)
V(volts)
V
1
(volts)
V
2
(volts)
Table2
Sl No
R(ohms)
I(amps)
L(mH)
R(ohm)
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Experiment 12
Resonance in LCR circuits
Apparatus:
Oscillator (1 to 150 kHz), variable capacitor, resistance, resistance box, AC mill voltmeter.
Purpose of the experiment:
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 Fall '09
 LIND
 Inductor, Electrical impedance, parallel LCR circuit

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