Galvanometer
1. Galvanometer is an instrument for detecting and measuring small electric currents.
2. Galvanometer is any sensitive instrument for detecting or measuring small electric currents.
The most common type is the D’Arsonval galvanometer, in which the indicating system consists of a light coil of wire suspended from a metallic ribbon between the poles of a permanent magnet. The magnetic field produced by a current passing through the coil reacts with the magnetic field of the permanent magnet, producing a torque, or twisting force. The coil, to which an indicating needle or mirror is attached, rotates under the action of the torque; the angle through which it rotates to balance the torsion of the suspension provides a measure of the current flowing in the coil. The angle is measured by the movement of the needle or by the deflection of a beam of light reflected from the mirror.
The ballistic galvanometer is designed to deflect its indicating needle (or mirror) in a way that is proportional to the total charge passing through its moving coil or to a voltage pulse of short duration. Any conventional galvanometer may also be employed as a ballistic type, but the latter has smaller torque and higher inertia in the coil.
Словник Cambridge Dictionary https://dictionary.cambridge.org/
Англійський словник Коллінза, https://www.collinsdictionary.com/
Omega Company https://www.omega.com/en-us/resources/