What role does a multimeter play in electrical measurement?

A multimeter is a versatile tool used in electrical measurements because it can measure multiple electrical quantities, including voltage, current, and resistance. This multifunctionality makes it invaluable for troubleshooting and diagnosing electrical issues in various applications.

For instance, when testing a circuit, a multimeter can be set to measure voltage across components to ensure proper operation. Similarly, it can measure the current flowing through a circuit to determine if it is within the expected range and can also test resistance to check for faulty components. The capability to measure these different electrical parameters provides a comprehensive understanding of the circuit's performance and functionality.

In contrast, the other options suggest limitations that do not reflect the true capabilities of a multimeter. A multimeter is not restricted to measuring only one quantity and can serve multiple functions, making it an essential instrument for anyone working with electrical systems.