1.1. Use the equation linking Power, Current and Potential difference to write 1 Watt [W] in SI base units.

1.2. Kilowatt-hour (kWh) is a unit of energy.

Using the equation linking Energy, Power and Time, convert 1 kWh to Joules.

1.3. Convert your answer from part (b) into MJ.

1.4. A 5.1 kW hair dryer is used for 45 minutes. The electricity bill is charged as 8 p per kWh used.

Calculate the cost of using the hairdryer in pounds.