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Kilowatt  Hour
When you buy electricity they charge you by
the kilowatt-hour (kWh). When you use 1000
watts for 1 hour, that's a kilowatt-hour.
kilowatt hour chart
For example chart:
When the number is low we
sometimes use watt-hours (Wh)
instead of kWh. For example, we
might say 240 watt-hours instead
of 0.24 kWh.
Watts?  is the measure of the rate of electrical
use at any moment. For example, a laptop
computer uses about 50 watts.