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Answered

A 100-W light bulb is left on for 20.0 hours. Over this period of time, how much energy did the bulb use?

Answer :

SPECTROJAMZIN

Answer:

Power = Energy/time

Energy = Power xtime.

Time= 20hrs

Power = 100Watt =0.1Kw

Energy = 0.1 x 20 = 2Kwhr.

This Answer is in Kilowatt-hour ...

If the one given to you is in Joules

You'd have to Change your time to seconds

Then Multiply it by the power of 100Watts.

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