What are the three major electrical defects in compressor motors detectable with an ohm meter?

The correct choice emphasizes critical electrical defects that can be identified using an ohmmeter, which is a device used to measure electrical resistance in a circuit. When testing compressor motors, the three major defects are as follows:

1. Open: This condition occurs when there is a break in the winding, resulting in an incomplete circuit. An open circuit will show an infinite resistance reading on the ohmmeter, indicating that no current can flow through the motor, thus rendering it inoperable.

2. Shorted: A short occurs when the winding wires inadvertently connect to each other or to the motor's frame. This can happen due to insulation failure. A short circuit will show a very low resistance reading, which means the winding is bypassed, allowing current to flow in an unintended path rather than through the motor. This situation can lead to overheating and damage.

3. Grounded: This defect occurs when one or more of the winding wires come into contact with the motor casing or ground. If this happens, the ohmmeter will show a low resistance reading between the winding and the ground. Grounding can lead to electrical shock hazards and requires immediate attention.

This choice encapsulates the essential defects that not only impact the functionality