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electromagnet

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electric motor

Overview page. Subjects: Physics.

A machine for converting electrical energy into mechanical energy. They are quiet, clean, and have a high efficiency (75–95%). They work on the principle that a current passing through a...

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Joseph Henry

Overview page. Subjects: Science and Mathematics — Arts and Humanities.

(1797–1878) US physicist,

who became professor of natural philosophy at Princeton in 1832. In 1829 he made an electric motor, and used insulated windings to produce a powerful...

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magnet

Overview page. Subjects: Physics — Chemistry.

A piece of magnetic material (see magnetism) that has been magnetized and is therefore surrounded by a magnetic field. A magnet, often in the shape of a bar or horseshoe, that retains...

See overview in Oxford Index