What is the primary use of an ammeter?

The primary use of an ammeter is to measure electric current. An ammeter is specifically designed to be connected in series with a circuit to allow current to pass through it without significantly altering the circuit's operation. It can provide readings in amperes (A), giving a direct measurement of the flow of electric charge. This is critical in electrical circuits for monitoring, troubleshooting, and ensuring safe operation by confirming that the current levels are within specified limits.

In contrast, devices like voltmeters measure voltage across components without interrupting current flow, ohmmeters measure resistance within a circuit, and thermometers measure temperature, highlighting the distinct and specialized functions of these instruments.