A current of 10 A rms flows when a single-phase circuit is placed across a 220-V rms source. The current lags the voltage by 60◦. Find the power dissipated by the circuit and the power factor.
7.12 A single-phase circuit is placed across a 120-V rms, 60-Hz source, with an ammeter, a voltmeter, and a wattmeter connected. The instruments indicate 12 A, 120 V, and 800 W, respectively. Find
a. The power factor.
b. The phase angle.
c. The impedance.
d. The resistance.
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