Rate of doing work
Tanusri Gururaj, Academic content writer of Physics at Edumarz
Power is the rate of doing work. It measures the speed at which the work is done.
Power = Work//Time
Unit: Watt (W)
1 watt can be defined as the power of an agent when 1 joule of work is done per second.
Average power = total energy/total time taken
1 kilowatt hour (kWh)
It is the energy used in an hour at a rate of 1000 joules per second.
1 kWh = 1 kW x 1h
= 1000W x 60s x 60s
= 3.6 x 106 J
Energy used in industries, households, etc is expressed in kilowatt hour as the unit joule is too small to express large quantities of energy.