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

Which has less electrical resistance: a thin wire or a thick wire (of the same length and same material) ?

Keeping the potential difference constant, the resistance of a circuit is halved. By how much does the current change?

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

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.