What is the primary function of an ammeter?

The primary function of an ammeter is to measure electrical current. An ammeter is designed to be connected in series with a circuit to allow the flow of current through it, enabling the measurement of the current in a unit called amperes. This measurement is critical for understanding how much electrical current is flowing in a circuit, which is essential for diagnosing electrical issues, ensuring the circuit operates correctly, or evaluating load conditions.

The design and operation of an ammeter ensure that it is capable of handling the current without significantly affecting the circuit's operation, providing accurate readings necessary for electrical work. Other instruments, such as voltmeters and ohmmeters, serve different functions, measuring voltage and resistance, respectively, but they do not measure current directly.