Hydro Quebec charges clients by the kilowatt hour. Is this a unit of power, energy or force. What is 500 kWh in SI units.

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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.

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