First slide

Power in a.c. circuit

Question

An electrical device operates at 12 A current and 120 V dc. it is connected with 250 V and 30 Hz ac. The power consumption will :

Easy

A

625 W
B

1250 W
C

6250 W
D

zero

Solution

Resistance of device = $\frac{120}{12} = 10 Ω$
Power consumption = $\frac{{V^{2}}_{rms}}{R} = \frac{{(250)}^{2}}{10} = 6250 W$

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