What is a voltmeter primarily used for?

A voltmeter is primarily used to measure the electrical potential difference, commonly referred to as voltage, across two points in an electrical circuit. This device is essential for understanding how much electrical energy is available to drive current through a load, such as a resistor or a motor. By measuring voltage, technicians can diagnose issues in circuits, ensure that components are receiving the appropriate voltage, and confirm the proper functioning of power supply systems.

Voltage measurements are crucial in various applications, such as troubleshooting electrical problems, verifying the integrity of power distribution, and ensuring safety standards are met. A voltmeter can be connected in parallel with the components in question, allowing it to accurately determine the voltage present without significantly affecting the current flowing through the circuit. This distinguishes it from devices that measure current directly or test for continuity, which serve different purposes in circuit analysis.