eli5 What is the difference between kW and kWh
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W or watt (kW kilowatt 1000watt) is the performance of something usually electric devices. A heater that is like 500W can give 500J of energy to whatever per second. So P=E/t. KWh is when you multiply the performance by some time E=P×t h so one hour 3600s × 0.5kW = 1800 kWh. So its a unit of energy.
There are some weird units like that. Like mAh on batteries miliAmperhour. Its a unit of charge. Amps are a unit of current which is charge/time, I=Q/t so I×t=Q. Units would be A×s=C but battery manufacturers dont like Coulomb for some reason. So instead they use mAh. 1 C = 1 A×1s -> 1 As, the same way 1 J = 1 W × 1s -> 1 Ws.
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