When using an ohmmeter on a transformer, what can you check for?

Using an ohmmeter on a transformer allows for checking several important conditions, which is why "all of the above" is the correct choice.

When measuring resistance to ground, you can determine whether there are any unintended paths for current that could lead to faults or ground issues. This helps in assessing the insulation integrity and safety of the transformer.

Checking for short circuits is another critical application of an ohmmeter. By measuring resistance across the windings, you can identify whether there's an unintended low-resistance path that would indicate a short circuit. This is essential for ensuring the transformer is functioning properly and safely.

Voltage readings, however, cannot be obtained with an ohmmeter as it is designed solely to measure resistance. Voltage measurements require a different tool, such as a voltmeter. This distinction clarifies why the option referring to voltage readings does not apply to what can be checked with an ohmmeter.

Overall, using an ohmmeter allows for effective diagnostics of both resistance to ground and potential short circuits, underscoring the importance of this tool in transformer maintenance and troubleshooting.