virranmittari

A virranmittari, or ammeter in English, is an electrical instrument used to measure electric current. Electric current is the flow of electric charge. Ammeters are always connected in series with the circuit element through which the current is to be measured. This means that the current must flow through the ammeter itself for it to be measured.

There are various types of ammeters, including analog and digital. Analog ammeters typically use a moving coil mechanism, where the current passing through a coil creates a magnetic field that interacts with a permanent magnet, causing a pointer to deflect across a calibrated scale. Digital ammeters, on the other hand, use electronic circuits to measure the current and display the reading as a numerical value on a screen.

The unit of electric current is the ampere (A). Ammeters are designed to have a very low internal resistance. This is crucial to minimize any impact on the circuit's current when it is inserted. A high internal resistance would impede the flow of current and lead to an inaccurate measurement. Ammeters are essential tools in electronics, electrical engineering, and various scientific applications for monitoring and troubleshooting electrical circuits. They are available in different ranges, from microamperes (µA) to thousands of amperes (kA), depending on the application.