side circuit

side circuit

noun Electricity.
See under phantom circuit.
Dictionary.com Unabridged

phantom circuit

noun Electricity.
a circuit derived from two suitably arranged pairs of wires, each pair being a circuit (side circuit) and also acting as one half of an additional derived circuit, the entire system providing the capabilities of three circuits while requiring wires for only two.

Origin:
1880–85

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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