To measure the resistance and impedance of an inductor with or without iron core.
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The variac (variable output A.C. source) is connected to A.C. Mains, A.C. ammeter and A.C. voltmeter are used for measuring A.C. current and voltage. The circuit will obey Ohm's law. The ratio of the voltmeter reading to the corresponding ammeter reading will give the impedance of the inductor (without iron core).
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