How to convert electric power in kilowatts (kW) to energy in joules (J).

You can calculate joules from kilowatts and seconds, but you can't convert kilowatts to joules since kilowatt and joule units represent different quantities.

The energy *E* in joules (J) is equal to 1000 times the power
*P* in kilowatts (kW), times the
time period *t* in seconds (s):

*E*_{(J)} = 1000 × *P*_{(kW)}* *×* t*_{(s)}

So

joules = 1000 × kilowatts × seconds

or

J = 1000 × kW×s

What is the energy consumption of an electrical circuit that has power consumption of 3 kilowatts for time duration of 3 seconds?

*E*_{(J)} = 1000 × 3kW × 3s = 9000J

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