What is a voltmeter?

A voltmeter is specifically designed to measure the electrical potential difference, also known as voltage, between two points in an electrical circuit. This measurement is crucial for understanding how much electrical energy is available to drive current through the circuit, which can influence the performance and functionality of electrical devices.

The voltmeter operates by being placed across the points where the voltage needs to be measured, ensuring that it provides an accurate reading of the potential difference. Understanding this measurement is foundational in electrical systems, as it helps technicians and engineers analyze circuit behavior, troubleshoot issues, and design systems that operate efficiently.

In contrast, devices designed for measuring current, resistance, or capacitance serve other specific functions and are not capable of measuring voltage directly, illustrating the distinct and vital role that the voltmeter plays in electrical testing and analysis.