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Answered 2012-07-25 18:24:11

If it is a 40 Watt bulb it converts energy at the rate of 40 Watts as long as it is switched on.

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On the end of any light bulb except for the fluorescent type there are numbers on the end of light bulb. The number will be followed by the letter w I.e.(65 w). W represents watts-amount of power used. On fluorescent light bulbs the curly cue ones it will be around the base where it screws into the socket.