What device is primarily used to measure electric current?

The primary device used to measure electric current is the ammeter. An ammeter is specifically designed for this purpose and is calibrated to display the measurement of current flowing through a circuit, typically expressed in amperes. It is important for tasks involving circuit analysis, troubleshooting, and ensuring that electrical systems operate within safe current limits.

While a voltmeter measures voltage, and an ohmmeter measures resistance, they are not intended for measuring current. A multimeter, on the other hand, can measure voltage, current, and resistance, but it is not specifically dedicated solely to current measurement like the ammeter. Thus, it is the ammeter that stands out as the most direct and relevant tool for measuring electric current.