What is bulb? and what are its uses ?

A light bulb produces light from electricity. In addition to lighting a dark space, they can be used to show an electronic device is on, to direct traffic, for heat, and for many other purposes. Billions are in use, some even in outer space. Early people used candles and oil lamps for light.

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i believe the answer is a

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.