Does a light use electricity when the bulb is burnt out and the switch is left on? No, it does not. Although the electricity is flowing to the bulb, one would think that it is using electricity. But, it is not. Even though the switch is turned on and electricity is available for use, because it isn't actually used we aren't charged for it. I wouldn't be so worried about taking the burnt bulbs out of the socket to save energy. Actually your better leaving it in until you change the bulb out. Not having a bulb in the socket and turning on the power could do more damage than good.
If we don't actually use the electricity in a functioning item we do not get charged for it.
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