magneto

A simple electrical AC generator based on a rotating permanent magnet which induces (see electromagnetic induction a current in a coil. It is the basis of an ignition system used in internal combustion engines without batteries, the spark voltage being induced as usual in a large secondary coil when the current in a primary coil is interrupted, but the primary current being itself induced by the rotating magnet rather than being drawn from a battery.

Related category

• ELECTRICITY AND MAGNETISM

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