Question

define 1 w power explain the largest unit of energy kwh​

Answer 1

1 watt is the power consumed by a device that carries 1 Ampere of current when operated at a potential difference of 1 volt.

i.e, 1 w=1v*1A

The commercial unit of electrical energy is kilowatt hour or KW h. .This is the commercial unit of electrical energy commonly known as 'unit'.

1 kW h=1000w*3600s=3.6*10^6 j

Answer 2

The kilowatt hour is a composite unite energy equal to 1 kilowatt of power sustained for one  hour. One watt is equal to 1 J/s. 1 kilowatt hour is 3.6   mega joules, which is the amount of energy converted if work is done at an average rate of one thousand watts for one hour.