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Q.

Initially, an electric heating element was consuming 300 W power working on a 110 V line. If the voltage of the line is changed to 220 V, then calculate the new power that will be consumed.

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a

1080 W

b

1120 W

c

1160 W

d

1200 W

answer is D.

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Detailed Solution

Power consumedP=V2R and P′=V12R∴P′P=V1V2∴P′=V1V2×P=2201102×300=4×300=1200W
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