Which device is used to measure current in an electric circuit?

An ammeter is specifically designed to measure electric current flowing through a circuit, which is expressed in amperes. When connected in series with the circuit, the ammeter allows the flow of current to pass through it, ensuring an accurate measurement. The construction of an ammeter is such that it has a low resistance to minimize its impact on the circuit, allowing it to effectively measure the current without significantly altering the circuit's behavior.

In contrast, a voltmeter is used to measure voltage (the potential difference between two points in a circuit) and must be connected in parallel. An ohmmeter, on the other hand, measures resistance within a circuit and cannot be used while the circuit is powered, as it operates on a different principle. A capacitor is a passive electronic component that stores electrical energy temporarily; it does not measure current. Thus, the choice of an ammeter for measuring current is both appropriate and effective in an electrical context.