Ammeter
An ammeter is a measuring tool used to measure the flow of electric current in a circuit. The electric current is measured in amperes; for this reason, some people call the ammeters as ampmeters, by mistake. It can measure 'resistance' of a current, speed of a current and force of a current (the units used are ohms, amperes, and volts) Ammeters are connected in series in a circuit with two connections.
Ammeter Media
Ammeter from the University of Dundee Physics Department
Ammeter from the old Penn Station terminal service plant in New York City
Wire carrying current to be measured.Spring providing restoring forceThis illustration is conceptual; in a practical meter, the iron core is stationary, and front and rear spiral springs carry current to the coil, which is supported on a rectangular bobbin. Furthermore, the poles of the permanent magnet are arcs of a circle.
Face of an older moving iron ammeter with its characteristic non-linear scale. The moving iron ammeter symbol is in the lower-left corner of the meter face.
Hot-wire ammeter.Illustration from 1911 Encyclopædia Britannica, article Amperemeter.
An integrating current meter calibrated in Ampere-hours or charge
Ayrton shunt switching principle
Zero-Center Ammeter
