A current of 5 amperes flows through a wire whose ends are at a potential difference of 3 volts. Calculate the resistance of the wire.

A potential difference of 20 volts is applied across the ends of a resistance of 5 ohms. What current will flow in the resistance?

A resistance of 20 ohms has a current of 2 amperes flowing in it. What potential difference is there between its ends?

Fill in the following blank with a suitable word :

Ohm's law states a relation between potential difference and ........................

Distinguish between good conductors, resistors and insulators. Name two good conductors, two resistors and two insulators.