James Joule, British physicist

Bildnummer 13736067
James Joule, British physicist
James Prescott Joule (1818-1889), British physicist. In 1840 he described the Joule effect, stating that the heat generated in a wire by an electrical current was proportional to the resistance and the square of the current. He made a series of measurements to show that a given quantity of work, from whatever source, always produced a particular quantity of heat. From this he deduced that energy was never destroyed, but was always conserved in a different form. He also showed that the temperature of a gas falls as it expands, even when it does no external work. The International System (SI) unit of energy is named in his honour. Photogravure c. 1913, after a portrait by G Patten (1863).
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Credit: Science Photo Library / WELLCOME IMAGES
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