Component having two coils of wire, the primary and secondary, whose lengths (number of turns) are in a fixed ratio to permit voltages to be stepped up or down and circuit impedances to be matched for maximum power transfer.
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Transformer --
Component having two coils of wire, the primary and secondary, whose lengths (number of turns) are in a fixed ratio to permit voltages to be stepped up or down and circuit impedances to be matched for maximum power transfer.