In an induction coil, a large secondary and small primary coil are wound together on a ferromagnetic core. When a low current in the primary is interrupted by a switch, the rapid change induces (see electromagnetic induction) a large voltage in the secondary. In a variant producing high-frequency AC (alternating current) voltage pulses, the primary current switches itself on and off through a relay, much as in an electric bell mechanism.
Related category• ELECTRICITY AND MAGNETISM
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