Which component measures the voltage across a circuit?

The voltmeter is specifically designed to measure the electrical potential difference, or voltage, across two points in a circuit. It is connected in parallel with the component or section of the circuit where you need to measure the voltage. By doing so, it can provide an accurate reading of the voltage present, allowing linemen and electricians to assess whether the voltage levels are within the desired parameters for safety and effectiveness.

In contrast, an amperemeter is used to measure the current flowing through a circuit, an ohmmeter measures resistance, and a wattmeter measures power (which is the product of voltage and current). Understanding the purpose of each instrument is crucial for effective troubleshooting and analysis in electrical work.