What tool is specifically designed for measuring voltage in a circuit?

A voltmeter is specifically designed for measuring voltage in a circuit. It operates by connecting across two points in a circuit, allowing it to measure the electrical potential difference between them. This capability makes it essential for diagnosing circuit issues, ensuring components are operating within their specified voltage range, and for overall electrical troubleshooting.

The design of a voltmeter often includes high impedance to avoid drawing significant current from the circuit it is measuring, which ensures an accurate reading without interrupting the circuit’s operation. This function is crucial in both automotive and residential electrical systems where maintaining circuit functionality while testing is important.

In contrast, tools like a wattmeter measure power, which is a function of both voltage and current, and an ammeter measures current flow in a circuit. An ohmmeter, meanwhile, is used for measuring resistance. Each of these tools has a specific purpose, but only the voltmeter is tailored for voltage measurement, reinforcing its unique role in electrical diagnostics.