Page 48 - Physics - XII

Activities
Activities

ACTIVITY - 1

Aim
To measure the resistance and impedance of an inductor with or without iron core.

Apparatus and Materials Required

Inductor coil (diameter ≈ 2 cm, number of turns = 2000), soft iron core cylindrical rod of diameter ≈ 1.75 cm
and length equal to that of inductor, a battery eliminator, a resistance box (0 to 10 KΩ), a one-way key,
connecting wires, a step down transformer with tappings (0-2-4-6 V, 50 Hz), D.C. milliammeter (0–500 mA),
A.C. milliammeter (0–500 mA), D.C. voltmeter (0–5 V), and A.C. voltmeter (0–5 V).

mA mA
+ – + –
Battery + Battery + RB R
eliminator RB R eliminator
(0-6 V) – (0-6 V) – Inductor Coil
K Inductor coil (air core) K (with soft iron core)

– + – +
V V
(a) Measurement of D.C. resistance (b) Measurement of D.C. resistance
of an inductor without iron core of an inductor with soft iron core

K mA K mA

Secondary of RB R Secondary of RB R
transformer transformer
200 V Inductor coil (air core) 200 V
A.C. A.C. Inductor coil (with soft iron core)
mains mains

V V
(c) Measurement of impedance (d) Measurement of impedance
of an inductor without iron core of an inductor with soft iron core
Fig. 1.1

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