Question

What's the real power of a purely resistive circuit in which the RMS voltage measures 80 volts and the RMS current measures 5 amps?
A. 85 watts

B. 120 watts

C. 240 watts

D. 400 watts

Answer 1

Answer:

400 watts

Explanation:

Given purely resistive circuit,

that implies power factor, cos \phi = 1.

RMS Voltage, VRMS = 80 V.

RMS Current, IRMS = 5 A.

Real power, P = VRMS * IRMS* cos \phi

P = 80*5*1 = 400 W

Hence, P = 400 W.

Answer 2

Answer:

400 watts

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