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The watt is named in honor of James Watt (1736–1819), an 18th-century Scottish inventor, mechanical engineer, and chemist who improved the Newcomen engine with his own steam engine in 1776, which became fundamental for the Industrial Revolution.
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Watt, unit of power in the International System of Units (SI) equal to one joule of work performed per second, or to 1746 horsepower. An equivalent is the power dissipated in an electrical conductor carrying one ampere current between points at one volt potential difference.
Watt is the unit of electric power. One watt is defined as energy consumption rate of one joule per second.
One Watt is a very small amount of power. Some devices need only a few Watts to operate, but other devices require larger amounts, and their consumption is measured in kilowatts (kW).
A watt is equivalent to one joule per second, making it a practical unit for relating electrical activity to real-world energy use across devices, circuits, and electrical systems.
What Is a Watt? Watts are units of electric power. Think of wattage as electricity at work when heating or illuminating a room in your home. Take a portable electric space heater rated at 500 watts. The space heater consumes 500 watts of power when it’s turned on. You’ll also encounter wattage when selecting light bulbs.
Learn what a watt is, how it measures power, and how it relates to volts, amps, horsepower, and kilowatt-hours. Practical examples included.