(a) Name a device which helps to maintain a potential difference across the ends of a conductor.(b) What is meant by saying that the potential difference between two points is 1 V?(c) Define Ohm's law. Write an expression for it.(d) What is the unit of resistance?(e) When the potential difference between the terminals of an electric heater is 110 V, a current of 5 A flows through it. What current will flow through the heater if the potential difference is increased to 220 V? What is the resistance of heater?

(a) Name a device which helps to maintain a potential difference acros

1.	(a) Name a device which helps to maintain a potential difference across the ends of a conductor.(b) What is meant by saying that the potential difference between two points is 1 V?(c) Define Ohm's law. Write an expression for it.(d) What is the unit of resistance?(e) When the potential difference between the terminals of an electric heater is 110 V, a current of 5 A flows through it. What current will flow through the heater if the potential difference is increased to 220 V? What is the resistance of heater?
Answer» (a) Name a device which helps to maintain a potential difference across the ends of a conductor. (b) What is meant by saying that the potential difference between two points is 1 V? (c) Define Ohm's law. Write an expression for it. (d) What is the unit of resistance? (e) When the potential difference between the terminals of an electric heater is 110 V, a current of 5 A flows through it. What current will flow through the heater if the potential difference is increased to 220 V? What is the resistance of heater?