RL Circuits – 13

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13. In a series RL circuit, 12 V rms is measured across the resistor, and 14 V rms is measured across the inductor. The peak value of the source voltage is ________.

(a) 18.4 V
(b) 26.0 V
(c) 2 V
(d) 20 V

Answer
Answer : (b)
Explanation
Explanation :
V­­­rms = (V­­­r^2 + V­­­l^2)^1/2
= (12^2 + 14^2)^1/2
= (340)^1/2 = 18.43

V­­­peak = V­­­rms * (2)^1/2
=18.43 * 1.41 = 26 volts

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