What instrument measures electric current in amperes?

The instrument that measures electric current in amperes is known as an ammeter. This device is specifically designed to provide a direct reading of the current flowing through a circuit. It is typically connected in series with the circuit whose current is being measured, allowing it to capture the flow of electricity in real time.

Understanding the role of an ammeter is crucial for anyone working with electrical systems, as it provides essential information to ensure that the current levels are appropriate for the devices in use. In contrast, other instruments have different functions; for example, a voltmeter measures voltage, a rheostat is used to control current by varying resistance, and a capacitor stores electrical energy. Each of these components serves vital roles in electronic circuits but does not provide a direct measurement of current in amperes like an ammeter does.