Question: what is the relation between 1kwh and joule?
Answer: One such example is in the energy unit kilowatt-hours (kWh). A kilowatt is equal to 1000 watts, so 1 kWh represents the amount of energy transfer that occurs over one hour from a power output of 1000 watts (i.e., joules per second). Thus 1 kWh is equal to 3,600,000 joules of energy transfer (work).