Question
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 ?
Answers
Henry
Rar = XL^2/R = 70^2/50 = 98 Ohms = Resistance at resonance.
P = V^2/Rar = 120^2/98 = Watts.
P = V^2/Rar = 120^2/98 = Watts.
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
S = (120)²/(50+j70)
S = 97.3 - j136.216 VA
Real Power drawn, P = 97.3 Watts