The Probert Encyclopaedia of Science & Technology

GALVANOMETER

A galvanometer is an instrument for measuring a (usually minute) electric current by the deflection of a magnetic needle. Basically, it is comprised of a coil beneath a suspended magnetic needle. When electric current passes through the coil it sets up a magnetic field and attracts the needle, the stronger the current the more powerful the magnetic field and the more pronounced the needle's deflection from the earth's magnetic field.
Research Galvanometer