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This is a very good question.

A Watt is a unit of power, or energy with respect to (divided by) time, and is defined as 1 Joule per second.

A 100 Watt light bulb consumes energy at a rate of 100 Joules (J) per second (s).

There are 60 seconds in every minute, and 60 minutes in every hour. So also, there are 3600 seconds in every hour (60 X 60).

100 J/s X 3600s = 360,000 J (the s cancels out in the division)

Your bulb consumes 360,000 Joules in one hour.

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