Let an alternating emf be applied to a circuit containing resistor R only such type of circuit is called resistive circuit.

Let the emf applied to the circuit is:

Let I be the current in the circuit then potential difference across the resistor is:

Comparing

with ohm’s law, we see that current is equal to voltage/resistance

This means the resistance R is resistance for ac which is in fact the resistance for dc. Therefore the behavior of R is same for ac and dc.

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