The current flowing in a coil is 3 A and the power consumed is 108 W. If the a.c. source is of 120 V, 50 Hz, the resistance in the circuit is (a) 24 Ω (b) 36 Ω (c) 12 Ω (d) 6 Ω

Answer: (c). Average power is consumed only in the resistance: P = I² R. R = P/I² = 108/9 = 12 Ω. So the answer is (c) 12 Ω.

The current flowing in a coil is 3 A and the power consumed is 108 W… | MHT CET 2024 (2 May, Shift 2)

Q9MHT CET 2024 · 2 MAY · SHIFT 2Easy

Electrical Power & Heating Effect

The current flowing in a coil is 3 A and the power consumed is 108 W. If the a.c. source is of $120\text{ V}, 50\text{ Hz}$ , the resistance in the circuit is

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Answer: (c)

Average power is consumed only in the resistance: $P = I^2 R$ .
$R = \frac{P}{I^2} = \frac{108}{9} = 12\ \Omega$ .
So the answer is (c) $12\ \Omega$ .

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