what is difference between kilowatt and kilowatt hour?

Those two units can be compared to a 'mile per hour' and a 'mile per hour - hour'.One is a rate.  The other is a quantity, after maintaining a rate for some time.-- 'Joule' is a unit of energy.  It's the amount of work (energy) you dowhen you push with a force of 1 newton though a distance of 1 meter.Lifting 10 pound of beans 3 feet off the floor takes about 40.7 joules of energy.-- 'Watt' is a rate of using energy . . . 1 joule per second.If you lift 10 pounds 3 feet off the floor in 1 second, your power is 40.7 watts.-- 'Watt-second' is the amount of energy used in one second,at the rate of 1 joule per second . . . 1 joule.-- 'Watt-hour' is the amount of energy used in one hour,at the rate of 1 joule per second . . . 3,600 joules.-- 'Kilowatt' is a bigger rate of using energy . . . 1,000 joules per second.-- 'Kilowatt - second' is the amount of energy used in one second,at the rate of 1,000 joules per second . . . 1,000 joules . -- 'Kilowatt - hour' is the amount of energy used in one hour,at the rate of 1,000 joules per second . . . 3,600,000 joules .Depending on where you live, 3,600,000 joules of energy boughtfrom the electric company costs something between 5¢ and 25¢.

Kilowatt hour is a measure of ENERGYKilowatt is a measure of POWER