Differentiate clearly between the kilowatt and the kilowatt-hour. A heater with an effeciency of 85 per cent develops 100MJ in 30 minutes at 200V. Find the energy consumption in kilowatt hours and the current taken. Find also the length of a wire in the element if its resistance is 0.26 ohm per metre.

Differentiate clearly between the kilowatt and the kilowatt-hour. A heater with an effeciency of 85 per cent develops 100MJ in 30 minutes at 200V. Find the energy consumption in kilowatt hours and the current taken. Find also the length of a wire in the element if its resistance is 0.26 ohm per metre.