What instrument is commonly used to measure electrical current?

An ammeter is specifically designed to measure the flow of electrical current in a circuit, typically expressed in amperes (A). It is connected in series with the circuit so that all the current flowing through the circuit also passes through the ammeter. This direct measurement allows for accurate readings of how much current is flowing at any given moment.

A voltmeter, for example, measures voltage, which is the electric potential difference between two points in a circuit. An ohmmeter measures resistance, while a wattmeter measures power, the rate at which electrical energy is transferred. Each of these instruments serves a different function in electrical measurements, which is why the ammeter is the correct choice for measuring current.