If the potential difference between the end of a wire of mixed resistance is doubled, by how much does the electric power increase?

If the potential difference between the ends of a fixed resistor is halved, the electric power will become:

If the potential difference between the ends of a fixed resistor is halved, the electric power will become:

IF the radius of a circle is doubled, by how much will the area increase ?

(a) Define the unit of resistance (or Define the unit ''ohm''). (b) What happens to the resistance as the conductor is made thinner? (c) Keeping the potential difference constant, the resistance of a circuit is doubled. By how much does the current change?