What is the primary purpose of a voltmeter?

The primary purpose of a voltmeter is to measure voltage in a circuit. A voltmeter is specifically designed to quantify the electrical potential difference between two points, and it does so by being connected in parallel with the circuit element of interest. By providing a direct reading of voltage, it allows technicians and engineers to assess the performance of electrical components and circuits, troubleshoot issues, and ensure that systems are operating within their designed voltage levels. This function is critical in various applications, from simple electrical circuits to complex aircraft systems, where maintaining the correct voltage is essential for safe and effective operation.