Which piece of equipment is essential for testing the continuity of a circuit?

A multimeter or continuity tester is essential for testing the continuity of a circuit because it can measure whether an electrical path is complete. When using these tools, they typically emit a tone or display a reading that indicates current can flow through the circuit, confirming that there are no breaks or faults in the wiring. This is a fundamental step in troubleshooting electrical systems to ensure that circuits are functional before proceeding with installations or repairs.

In contrast, while a voltmeter measures the voltage present in a circuit, it does not provide continuity information. A power analyzer is used for measuring a variety of electrical parameters, but it is not specifically designed to check if a circuit is complete. Similarly, a circuit breaker is a protective device that interrupts the flow of current in the event of an overload or fault, but it doesn't test for continuity by itself. Thus, the multimeter or continuity tester is the appropriate tool for this particular task.