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A circle with a G and a pointer arc.
Also known as: Galvanometer, Current detector, Circle with a G, Null detector
A galvanometer detects small currents and shows their direction, with the needle deflecting either side of a central zero. It is the ancestor of every moving-coil meter, and its distinguishing feature is that centre zero — an ammeter reads from zero upward.
Denotes a galvanometer: a sensitive current-detecting instrument indicating both magnitude and direction.
Contexts: Electrical equipment
Has a centre-zero scale, deflecting either way from the middle, which is what distinguishes it from an ammeter.
Contexts: Electrical equipment
Is the null detector in bridge measurements, where the reading of interest is zero rather than a value.
Contexts: Electrical equipment
A circle enclosing a capital letter G, with a lead at each side.