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James Prescott Joule (1818)
Joule was born in 1818 in England. A physicist, he shared in discovering the law of the conservation of energy. The law states that energy used in one form reappears in another and is never lost. In 1840, he stated a law, now called Joule's Law, that heat is produced in an electrical conductor. The international unit of energy, the joule, is named in his honor.