SI unit of power is watt.

1 unit = 1 kilowatt hour

Given, power, P = 1500 watt = 1.5 kW

Time, t = 10 hour

Energy = power x time = 1.5 x 10 =15 kW h

Energy consumed by the heater = 15 kW h = 15 units

1 unit = 1 kilowatt hour

Given, power, P = 1500 watt = 1.5 kW

Time, t = 10 hour

Energy = power x time = 1.5 x 10 =15 kW h

Energy consumed by the heater = 15 kW h = 15 units