a device used to indicate the presence and direction of a small electric current, especially used to detect a null or balanced condition in a bridge circuit
Instrument for measuring small electric currents by deflection of a moving coil. A common galvanometer consists of a light coil of wire suspended from a metallic ribbon between the poles of a permanent magnet. As current passes through the coil, the magnetic field it produces reacts with the magnetic field of the permanent magnet, producing a torque. The torque causes the coil to rotate, moving an attached needle or mirror. The angle of rotation, which provides a measure of the current flowing in the coil, is measured by the movement of the needle or by the deflection of a beam of light reflected from the mirror
consists of a coil of wire suspended in the magnetic field of a permanent magnet When current flows through this coil of wire, the magnetic field exerts a torque on the loop, which is opposed by a spring When you attach a pointer to this coil, you get an analog readout of the current