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1 joule is the energy equal to 1 watt for 1 second.

100 joules = 100w for 1 second.

A 100 watt light bulb converts 100 joules of electrical energy into heat and light every second.

Only about 1% of this is useful light, the rest is wasted as heat.

Answer

Power is defined as the rate of doing work. As work is expressed in joules (J), it follows that power is measured in joules per second (J/s) -however, in SI, this is given a special name: the watt (W).

So one joule per second is exactly equivalent to one watt. Therefore, 100 J/s is exactly equivalent to 100 W.

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