Hydro Quebec charges clients by the kilowatt hour. Is this a unit of power, energy or force. What is 500 kWh in SI units.
Kilowatt is the unit of power in the SI system. One watt is the power equivalent to one joule of energy being consumed in a second. Kilowatt is equal to 1000 watts.
Kilowatt hour on the other hand is a unit of energy. Power is energy divided by time; by multiplying power by time the resultant unit is again that of energy. As there are 3600 seconds in an hour, one kilowatt hour is equal to 1000*3600 = 3.6*10^6 J
If 500 kWh is consumed in one month, the amount of energy being consumed is equal to 1800*10^6 J.