The device used to measure electric current is called an ammeter. It is an important electrical instrument used in science laboratories, electrical engineering, and household circuit testing. An ammeter measures the flow of electric charge in a circuit and shows the reading in amperes (A).
An ammeter is always connected in series with the circuit so that the same amount of current passes through both the circuit and the measuring device. If it were connected in parallel, it could give incorrect readings or get damaged. Modern digital ammeters provide highly accurate readings, while analog ammeters use a pointer and scale.
Electricians and engineers use ammeters to check whether electrical appliances are working properly and to ensure safety in circuits. It helps in identifying overloads, short circuits, or abnormal current flow.
In short, the ammeter is the key device for measuring electric current and plays a vital role in understanding and controlling electrical systems safely and efficiently.