Who is James Joule?
- James Prescott Joule was an English physicist and brewer, born in Salford, Lancashire. Joule studied the nature of heat, and discovered its relationship to mechanical work. This led to the Law of Conservation of Energy and the First Law of Thermodynamics.
- The joule is named after James Joule. James Joule and Lord Kelvin (famous mathematical physicist) worked together to develop the absolute scale of temperature.
- Tutored by John Dalton (famous chemist, meteorologist, and physicist)
- James Joule was born December 24th 1818, and died October 11th 1889.
- Helped to disapprove the Caloric theory.
What is the Joule?
- The joule is a unit of energy, work, or amount of heat fund in the SI system.
- A joule is equal to the energy expended (or work done) in applying a force of one newton through a distance of one metre (1 newton metre or N·m).
- A joule is not to be confused with a Newton metre.
Practical Examples of the Joule
One joule in everyday life represents about;
- The energy required to lift a small apple (mass of 100g) vertically through one metre.
- The energy released when the same apple falls one metre to the ground.
- The heat required to raise the temperature of 1 g of water by 0.24 K.
- The average energy released as heat by a person at rest.
- The kinetic energy of a tennis ball moving at 23 km/h
- The kinetic energy of a 50 kg human moving very slowly (0.2 m/s)
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