Question:
Where do eletrons come from to flow? Are they lost by the conductor?if they are lost by the conductor then after some time the conductor should become useless because it would not have more electrons to lose.
Answer:
Electrons come into flow as they are lost from the mattalic conductors. But they are not literally lost. They are in circulation in the circuit when a metal conducts electricity. So it is never lost from the metal.
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