What device is used to measure voltage in an automotive electrical system?

A multimeter is the correct device used to measure voltage in an automotive electrical system. This versatile tool can measure various electrical parameters, including voltage, current, and resistance. When measuring voltage, the multimeter can provide both AC and DC readings, which is essential in automotive applications since vehicles often use DC voltage from the battery and AC voltage in some components like alternators.

Using a multimeter involves connecting the positive lead to the positive side of the circuit and the negative lead to the negative side or ground. The device then displays the voltage reading, allowing technicians to diagnose and troubleshoot electrical issues effectively.

The other devices mentioned serve different purposes. An oscilloscope is used primarily to visualize the waveform of electrical signals over time and is more complex than necessary for simple voltage measurements. An ammeter measures current flow, which is essential for diagnosing issues related to current draw rather than voltage levels. Lastly, an ohmmeter is used to measure resistance in a circuit, which helps in assessing continuity or the condition of components but does not measure voltage directly. Thus, the multimeter is the most appropriate choice for measuring voltage in an automotive environment.