When testing a single-phase motor, which terminals typically show the lowest resistance?

When testing a single-phase motor, the terminals representing the connection between the common terminal and the run terminal typically show the lowest resistance. This is because the run winding of the motor is designed to continuously operate when the motor is running and generally has a low impedance to allow for efficient current flow.

The run winding is often designed to be more robust with lower resistance compared to the start winding, which is used only for initial startup. In many cases, the electrical characteristics of the winding provide a direct path for current, which results in lower resistance measurements across the common and run terminals. When assessing the overall health of the motor, a lower resistance reading at these terminals indicates that the motor windings are intact and functioning properly.

In contrast, the other options may represent different combinations or connections within the motor that may not necessarily reflect the same low resistance due to the nature of their functionality or the winding configurations involved.