Question

what is the cause of resistance offered by the metallic wire in the flow of current through it ?​

Answer 1

Answer:

Electrons are free for movement, but positive ions do not move; thus, when a potential difference is applied across the circuit, and when free electrons begin to move, they collide with these fixed ions. This collision is the major cause of resistance offered by the metallic wire in the flow of current through it.

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Answer 2

A metal includes free electrons and fixed positive ions. Positive ions give away their valence electrons and thus attain a positive charge. Electrons can move freely in conductor, but positive ions do not move; thus, when a potential difference is applied across the circuit, free electrons begin to move, and they collide with these fixed ions. This collision is the major cause of resistance offered by the metallic wire in the flow of current through it.