Q.

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 :

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a

625 W

b

1250 W

c

6250 W

d

zero

answer is C.

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Detailed Solution

Resistance of device = 12012=10ΩPower consumption = V2rmsR=250210=6250 W
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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 :