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As current is the rate of flow of electric charges

  • As I=Q/t

so,there must be free electrons for the flow of electric current in a circuit.Then when voltage is applied at the terminals of circuit the free electrons acquire an average velocity called as drift velocity in the opposite direction to that of electric field (-E).Now the free electrons modify there random motion and a steady current begin to flow in a circuit.

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Q: What must occur before the current flows through a circuit?
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