Which of the following describes the purpose of using an in-line ammeter?

The purpose of using an in-line ammeter is to measure electrical current. An ammeter is specifically designed to be connected in series with a circuit component to gauge the flow of electric current through that component. This is essential for diagnosing issues in electrical systems, ensuring that currents are within safe operating levels, and performing necessary calculations involving power and energy consumption.

Measuring current is crucial for gas technicians as it helps in assessing the operation of electrical appliances, determining if they are drawing the expected amount of current, which can indicate whether they are functioning properly or if there may be a fault.

Resistance, voltage, and capacitance are measured using different instruments: a multimeter or ohmmeter measures resistance, a voltmeter measures voltage, and a capacitance meter measures capacitance. Thus, these concepts, while relevant to electrical diagnostics, do not pertain to the specific purpose of an in-line ammeter, which is exclusively focused on current measurement.