What type of device is an ammeter?

An ammeter is specifically designed to measure electric current, which is the flow of electric charge in a circuit. Current is expressed in amperes (A), hence the name "ammeter." This instrument is typically connected in series with the circuit to ensure it can accurately gauge the amount of current flowing through the circuit. Understanding this fundamental function is crucial for anyone working in electrical fields, as knowing the current is essential for circuit diagnostics and troubleshooting.

The other options refer to different types of electrical measuring devices: a voltage meter, also known as a voltmeter, measures the difference in electrical potential between two points; a power meter measures the rate at which electrical energy is being consumed or generated; a resistance meter, often called an ohmmeter, measures the resistance to current flow in ohms. Each of these devices serves a unique purpose, distinct from the primary function of the ammeter.