Nate Electrical Practice Exam 2026 - Free Electrical Practice Questions and Study Guide

An ammeter is specifically designed to measure electric current in a circuit. It operates by being connected in series with the electrical components through which the current is flowing. This allows the ammeter to accurately assess the amount of current, usually expressed in amperes (A), that passes through the circuit. By measuring the flow of electrons, an ammeter provides valuable information about the performance and efficiency of electrical systems.

In contrast, voltage is measured by a voltmeter, which is connected in parallel to the circuit components. Resistance is measured by an ohmmeter, which, like a voltmeter, is not placed in the same path as the current. Frequency measurement requires a different instrument altogether, typically a frequency counter or oscilloscope, as it involves the rate at which the current alternates. Thus, understanding the specific function of an ammeter helps clarify its essential role in electrical diagnostics and monitoring.