A unit of power in the International System of Units, measuring the rate of energy transfer. One watt equals one joule per second.
Named after James Watt (1736-1819), Scottish inventor who improved the steam engine. The unit was adopted in 1889 to honor his contributions to engineering and the Industrial Revolution.
James Watt's name appears on every light bulb and electrical device, making him perhaps the most frequently encountered scientist in daily life - his surname illuminates billions of homes every night.
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