An ammeter is an instrument used to measure which of the following?

An ammeter is specifically designed to measure electric current flowing through a circuit. It is connected in series with the circuit component whose current is being measured, allowing it to directly quantify how much current (in amperes) is passing through the circuit at any given moment. Understanding the measurement of current is crucial for diagnosing issues in electrical systems, ensuring that they operate within expected limits, and allowing for proper calculations in HVAC applications where electrical components play a significant role.

In contrast, voltage is measured with a voltmeter, which is connected in parallel across a component. Resistance is measured using an ohmmeter, which evaluates the opposition to current flow in a circuit. Power, typically measured in watts, can be calculated using both voltage and current measurements but is not directly measured by an ammeter. Thus, the focus of the ammeter on current measurement makes it a vital tool in electrical and HVAC systems troubleshooting and analysis.