What is the common use of a voltmeter in electrical work?

A voltmeter is specifically designed to measure the electrical potential difference, or voltage, between two points in an electrical circuit. This capability is essential for diagnosing problems, ensuring systems are operating within specified voltage ranges, and verifying the presence or absence of voltage in various components of an electrical system.

Using a voltmeter involves connecting its probes across the points where the voltage needs to be measured. The device then displays the voltage level, which can help technicians understand how much electrical pressure is available to drive current through the circuit. Accurate voltage measurement is crucial for maintaining electrical safety and functionality in any system.

The other options involve functions that are handled by different types of instruments, such as ohmmeters for resistance measurement, capacitance meters for measuring capacitance, and ammeters for current measurement. Each of these devices is tailored to provide specific data that cannot be obtained through a voltmeter, reinforcing the unique role of the voltmeter in electrical work.