What’s the difference between watts and watt-hours?Īn "amp", short for ampere, is a unit of electrical current which SI defines in terms of other base units by measuring the electromagnetic force between electrical conductors carrying electric current. Many other pieces of equipment come with power ratings to describe the rate at which they use energy. (One horsepower is equivalent to 750 watts, so that's a 286-hp car.) A small gasoline generator puts out 2,000 watts the Vermont Yankee nuclear power plant puts out 650 megawatts, or 650,000,000 watts. A medium-sized car might consume 100,000 watts. A laborer working through the day will put out 75 watts of power. For those who are keeping track, one watt is equivalent to electricity flowing at a rate of one joule per second in the metric system, which is also equivalent to 3.4 Btus per hour.Ī 60-watt lightbulb will consume electricity at a rate of 60 watts. Watts are basically the miles-per-hour measurement of the electrical world-they tell you how fast the electrons are speeding down the highway. Power is a measure of the rate at which energy flows, and in electrical systems it is measured in watts (W). Watt hours are generally measured in kilowatt-hours. It is the amount of energy an item consumes over a given timeframe a way to measure the amount of work generated or performed. Power is measured in watts.Įnergy is the capacity to do work – such as creating light, heat, or motion.Ī watt-hour is a unit of energy. Power is the rate at which energy is either produced or consumed the rate at which energy flows. One watt is equivalent to electricity flowing at a rate of one joule (unit of energy) per second. It is the amount of energy an item needs to function the rate at which energy is consumed.
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