Which tool determines if the windings on an electric motor are shorted?

The correct choice is the Ohmmeter because it is designed to measure electrical resistance and is particularly effective in assessing the condition of the windings in an electric motor. When using an ohmmeter, you can check for continuity in the windings and identify any short circuits. A shorted winding will show a very low resistance or zero resistance reading, indicating that the windings are in direct contact with each other or shorted to ground.

This measurement is critical in troubleshooting electric motors, as it helps to identify potential failures that could affect performance or safety. By measuring resistance, you can also determine if there is a break in the winding, which would show as an infinitely high resistance reading or an open circuit.

Using a voltmeter, ammeter, or wattmeter does not provide the necessary information about the winding integrity. A voltmeter measures voltage, an ammeter measures current, and a wattmeter measures power consumption but does not directly indicate the state of the windings. Therefore, for diagnosing winding issues specifically, the ohmmeter is the appropriate tool.