Disclaimer: I have no idea what I’m talking about.
Let’s say you have an appliance, that uses 1 kW of power. If you ran it for an hour, it would use 1kWh.
That is required because kW is a level of power, you aren’t buying 1 kW, you are buying the use of 1 kW for an entire hour. So 1 kWh is used there.
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