The energy *E* in kilojoules (kJ) is equal to the power *P* in watts (W) times the time period *t* in seconds (s):

*E*_{(kJ)} = *P*_{(W)} * *t*_{(s)} / 1000

So

Kilojoules = Watts * Seconds / 1000

or

kJ = W * s / 1000

Find the energy consumption of an electrical circuit that has a power consumption of 300 watts given a time duration of 3 seconds.

*E*_{(kJ)} = 300W * 3s / 1000 = 0.9kJ

kJ to Watts ►

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