Zero watt bulb, by its name, doesn't mean that it will not consume any energy. In fact the rating of zero watt bulb is 10-15 Watt. But why is it named as zero watt ?
The answer is, in olden days, when all other loads are turned off and only one 10-15 W bulb is turned on, as sophisticated measuring instruments were not present, the conventional electromagnetic measuring instruments present by that time were not able to record very small consumption (10-15W). So the name zero watt has come into use for 10-15 W bulb.
But now with the presence of much sophisticated instruments even a fraction of watt can be recorded, but the convention of calling them as zero watt bulbs still continues .................
The answer is, in olden days, when all other loads are turned off and only one 10-15 W bulb is turned on, as sophisticated measuring instruments were not present, the conventional electromagnetic measuring instruments present by that time were not able to record very small consumption (10-15W). So the name zero watt has come into use for 10-15 W bulb.
But now with the presence of much sophisticated instruments even a fraction of watt can be recorded, but the convention of calling them as zero watt bulbs still continues .................
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