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===About kilowatt-hours===
: The '''kilowatt-hour''' is used by electricity suppliers instead of [[Joule]]s.
: A '''kilowatt-hour''' is calculated by multiplying the power rating of an appliance in [[kilowatt]]s by the time the appliance is used for in [[hour]]s.
: [[Energy]] ([[kilowatt-hour]]s) = [[Power]] ([[kilowatt]]s) x [[time]] ([[hour]]s)
: A '''kilowatt-hour''' is 3,600,000 [[Joule]]s.