Why does an electric field exist inside a conductor wire in a circuit?

[prashant3507]

it is true that no electric field exists inside a conductor but still when we use wire(a conductor)in electric circuits electric field exists inside it.

 

[Doc Al]

The statement that the electric field inside a conductor is zero is only true in the electrostatic case. Within a current-carrying conductor there are moving charges and a non-zero electric field.