Joule experiments led him to discover the law of conservation of energy and the first law of thermodynamics resulting in the unit of energy in the metric system being named after him.
Joule studied the nature of heat and discovered its relationship with energy which in turn led to law of conservation of energy which led to the development of the first law of thermodynamics. The SI unit of energy is named after him, Joule.
One Joule represents the work done by a force of 1 Newton moving 1 m in its own direction.
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