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A dot beside one end of each of two coupled windings.
Also known as: Polarity dot, Winding sense dot, Phasing dot, Dot on a transformer
The dots on a transformer symbol say which winding ends are in phase: current entering the dotted end of one winding produces current leaving the dotted end of the other. Get them wrong and a circuit that should add signals subtracts them.
Denotes the relative winding sense of magnetically coupled inductors, marking terminals of the same instantaneous polarity.
Contexts: Electrical equipment
Determines whether coupled windings add or oppose, so reversing one winding's dot inverts the output.
Contexts: Electrical equipment
Carries no information about turns ratio or coupling strength — only about relative phase.
Contexts: Electrical equipment
A small filled dot placed beside one end of each of two parallel coil symbols.