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OpenStudy (anonymous):

A 160 W street lamp is operated for 10 hours a day. How much energy does it take to operate the lamp for 70 days? Express your answer in kW*h then also in joules

OpenStudy (jamesj):

How much energy does a 160 W device use in 1 second?

OpenStudy (jamesj):

By definition Power = Energy / Time in units: Watts = Joules / second Hence 1 Watt means 1 Joule per second.

OpenStudy (jamesj):

Therefore, how much energy does a 160 W device use in 1 second?

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