How to convert Watts to Kilojoules

How to convert electic power in Watts (W) to energy to Kilojoules (kJ).

It is possible to calculate kilojoules from seconds and watts, but you cannot convert watts to kilojoules since watt and kilojoule units represent different quantities.


Watts to Kilojoules formula

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

Example

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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