Early ammeters were laboratory instruments that relied on the Earth's magnetic field for operation. Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters or microammeters.
An ammeter usually has low resistance so that it does not cause a significant voltage drop in the circuit being measured. The ammeter is usually connected in series with the circuit in which the current is to be measured. Electric currents are measured in amperes (A), hence the name. As the current through the coil increases, the plunger is drawn further into the coil and the pointer deflects to the right.Īn ammeter (abbreviation of Ampere meter) is a measuring instrument used to measure the current in a circuit. Demonstration model of a moving iron ammeter.
0 kommentar(er)
