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A device consumes 2 kilowatt hours of energy in 1 hour. How many joules of energy does it consume?

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7.2 x 10⁶ J

7.2 x 10⁴ J

7.2 J

7.2 x 10³J

answer is D.

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Detailed Solution

Energy consumed: E=Pt

= 2 kW x 1 hr

= 2 kWh

=2 x 3.6 x10⁶ J

=7.2 x 10⁶ J

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