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relate watt to joule?

Watts to joules calculation formula

The energy E in joules (J) is equal to the power P in watts (W), times the time period t in seconds (s):

E(J) = P(W)  x  t(s)
So
joules = Watts  x  seconds
or
J  =  W   x—   s

Example:

What is the energy consumption of an electrical circuit that has power consumption of 30 watts for time duration of 3 seconds?

E(J) = 30W   x  3s = 90J


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