Can anyone please explain in detail how galvanometer is used measuring current and voltage?
History The deflection of a magnetic compass needle by current in a wire was first described by Hans Oersted in 1820. The phenomenon was studied both for its own sake and as a means of measuring electrical current. The earliest galvanometer was reported by Johann Schweigger at the University of Halle on 16 September 1820. André-Marie Ampère also contributed to its development. Early designs increased the effect of the magnetic field due to the current by using multiple turns of wire; the instruments were at first called “multipliers” due to this common design feature. The term “galvanometer”, in common use by 1836, was derived from the surname of Italian electricity researcher Luigi Galvani, who discovered that electric current could make a frog’s leg jerk. Originally the instruments relied on the Earth’s magnetic field to provide the restoring force for the compass needle; these were called “tangent” galvanometers and had to be oriented before use. Later instruments of the “astatic” t
