James Prescott Joule, British physicist

James Prescott Joule, British physicist

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Caption: James Prescott Joule (1818-1889), British physicist. Joule showed that different forms of energy are interchangeable, and that energy cannot be created or destroyed. He had little formal education, and never held an academic post. His business was brewing, but he worked in a private laboratory built for him by his father. While experimenting here, he found the relationship between the current in a wire, the wire's resistance, and the heat the current produced. He also worked on gases, and showed that an expanding gas is cooled by its expansion. The SI unit of energy is named in his honour.

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Keywords: black-and-white, current, electrical, electricity, energy, expansion, gas, gases, heat, historical, james prescott, joule, monochrome, physicist, physicists, physics, portraits, resistance, surname j, thermodynamics, unit

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