Galvanometer Analog -35-0-35mV

A galvanometer is an instrument that can detect the existence or measure the intensity of an electric current in an electrical circuit. It is an instrument for measuring up to low electrical voltages, depending on the existence of current and the mechanical deviation (rotation) of a coil. A simple galvanometer consists of a D ‘Arsonval mechanism and a scale with zero in the middle. The D’Arsonval mechanism is also known as a moving coil mechanism.

The galvanometer has a spiral coil which is located inside a magnetic field. The shape of the permanent magnet that creates the magnetic field is annular, while the coil is supported in the middle and can rotate around the point of support. The indicator indicator is also attached to the coil. When an electric current passes through the coil, it receives a torque, which forces it to rotate (of course dragging the pointer as well). This torque is proportional to the intensity of the current and so the instrument can, from the angle of deviation of the indicator, measure electrical currents, as long as the indicator moves on a properly rated scale. There is also a return spring to return the pointer to its original position.

Analog Galvanometer -35-0-35mV

In addition to the simple indication of current in a circuit, always for low voltages, the galvanometer can also be used as an instrument for measuring current (ammeter) or potential difference (voltmeter), depending on how it is connected to the circuit and the rating of the scale. of.

The accuracy of such an instrument depends mainly on the homogeneity of the magnetic field created by the permanent magnet. It also depends on whether the metals from which it is made have large expansions when heated, because the passage of electricity through a conductor causes it to heat up.