An inductance L, a capacitance C and a resistance R may be connected t

1.	An inductance L, a capacitance C and a resistance R may be connected to an AC source of angular frequency ω, in three different combinations of RC, RL and LC in series. Assume that ωL = 1/ωC. The power drawn by the three combinations are P1, P2, P3 respectively. Then,(a) P1 > P2 > P3 (b) P1 = P2 < P1 (c) P1 = P2 > P1 (d) P1 = P2 = P3
Answer» Correct Answer is: (b) P₁ = P₂ < P₁ The LC circuit draws no power. When ωL = 1/ωL, the impedances of the RC and LR circuits are equal, and they draw the same power.

An inductance L, a capacitance C and a resistance R may be connected to an AC source of angular frequency ω, in three different combinations of RC, RL and LC in series. Assume that ωL = 1/ωC. The power drawn by the three combinations are P1, P2, P3 respectively. Then,(a) P1 > P2 > P3 (b) P1 = P2 < P1 (c) P1 = P2 > P1 (d) P1 = P2 = P3

Answer»

Correct Answer is: (b) P₁ = P₂ < P₁

The LC circuit draws no power. When ωL = 1/ωL, the impedances of the RC and LR circuits are equal, and they draw the same power.

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