# RL Circuits – 11

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11. A 1.5 kΩ resistor and a coil with a 2.2 kΩ inductive reactance are in series across an 18 V ac source. The power factor is ________.

(a) 564
(b) 0.564
(c) 6.76
(d) 55.7

Explanation
Explanation :
z = (r^2+XL^2)^1/2
= (1500^2+2200^2)^1/2 = 2663
power factor = cosq = r/z
= 1500/2663 = 0.564
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