How can the continuity of electrical circuits be effectively checked?

Using an ohmmeter is an effective method to check the continuity of electrical circuits because it measures the resistance in the circuit. When an ohmmeter is connected across two points in the circuit, it allows you to determine if there is a complete path for current to flow. If the circuit is continuous, the resistance measured will be low (close to zero). Conversely, if there is a break in the circuit, the resistance will be very high or infinite, indicating a discontinuity. Therefore, the ohmmeter provides a reliable way to ensure that the circuit is intact and functioning properly.

A multimeter can also be used to check continuity, but using it specifically in the ohm measurement mode is more precise for this purpose. Visual inspection may help identify obvious issues like damaged wires but cannot confirm continuity definitively. Using a power source could potentially test the circuit's operation, but it does not provide a straightforward measure of continuity and can be unsafe if performed incorrectly.