Joule Effect

Joule Effect is a term commonly used to refer to any of several different physical effects discovered or characterized by English physicist James Prescott Joule. These physical effects are not the same, but all are frequently or occasionally referred to in literature as the "Joule effect". These physical effects include:

• Joule's first law, a physical law expressing the relationship between the heat generated and current flowing through a conductor.
• Magnetostriction, a property of ferromagnetic materials that causes them to change their shape when subjected to a magnetic field.
• In Joule expansion, the cooling of a gas when it is allowed to expand freely.
• The Gough-Joule effect or the Gow-Joule effect, which is the tendency of elastomers to contract if heated while they are under tension.