Which method allows a troubleshooter to confirm that a manual switch is functioning?

Measuring resistance is a reliable method to confirm that a manual switch is functioning correctly. When a switch is in the "on" position, it should exhibit a low resistance reading, indicating that electrical continuity is present and current can flow through. Conversely, if the switch is in the "off" position, the resistance should be very high or infinite, indicating that there is no continuity, and current should not flow.

This method is particularly useful because it provides quantitative data about the switch's mechanical and electrical condition. It can help identify issues such as wear, dirt, or internal faults within the switch that might impair its operation. By measuring resistance with a multimeter, the troubleshooter can effectively ascertain the switch's status and ensure that it is functioning as expected within the circuit.

Other methods, while useful in their own right, may not provide the same level of definitive confirmation regarding the internal functioning of the switch itself. For example, visual inspection could miss internal issues, while an audible click test relies on mechanical noise that may not indicate actual electrical performance. Measuring current flow could confirm switch operation under load but would be less practical without already knowing whether the switch is functioning at all.