James joule biography cortaca

English physicist (1818–1889)

James Prescott Joule (;^[a] 24 December 1818 – 11 October 1889) was an English physicist.

Joule studied the nature of heat and discovered its relationship to mechanical work. This led to the law of conservation of energy, which in turn led to the development of the first law of thermodynamics.

James joule biography cortaca

The SI unit of energy, the joule (J), is named after him.

He worked with Lord Kelvin to develop an absolute thermodynamic temperature scale, which came to be called the Kelvin scale. Joule also made observations of magnetostriction, and he found the relationship between the current through a resistor and the heat dissipated, which is also called Joule's first law.

His experiments about energy transformations were first published in 1843.

Early years

James Joule was born in 1818, the son of Benjamin Joule (1784–1858), a wealthy brewer, and his wife, Alice Prescott, on New Bailey Street in Salford.

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