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The electrical term Watts is a measure of heat. It is calculated by multiplying amps times volts, but it is still a measure of heat.

A 50w light bulb made for 12 volts produces about the same amount of heat as a 50w light bulb made for 120 volts.

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An incandescent bulb produces heat when turned on, with about 90 of its energy being emitted as heat and only 10 as light.


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