Asked by Student

a coil has resistance of 50 ohms and reactance of 70 ohm's. a capacitor is connected in parallel to produce resonance. the source is 120v. what is the power drawn by the circuit ?
Answered by Henry
Rar = XL^2/R = 70^2/50 = 98 Ohms = Resistance at resonance.

P = V^2/Rar = 120^2/98 = Watts.

Answered by Emmanuel
Complex Power, S = V²/Z = P+jQ
S = (120)²/(50+j70)
S = 97.3 - j136.216 VA

Real Power drawn, P = 97.3 Watts
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