To convert kilowatt-hours (kWh) to joules (J), you need to multiply the kWh value by 3,600,000. There are 3,600 seconds in one hour and 1,000 watts in one kilowatt. Therefore, there are 3,600,000 joules in one kilowatt-hour.
For example, if you want to convert 10 kWh to joules, you would multiply 10 kWh by 3,600,000 joules/kWh. This gives you 36,000,000 joules.