What does a good capacitor show when tested with an ohmmeter?

A good capacitor, when tested with an ohmmeter, should show charging current followed by a steady high resistance reading. Initially, as the ohmmeter begins to test the capacitor, the meter registers low resistance because the capacitor is charging from the current generated by the meter itself. Once the capacitor is fully charged, it will block further current flow, which is reflected in the subsequent high resistance reading.

This behavior indicates that the capacitor is functioning properly—capable of storing charge—and is not leaking or shorted. A steady high resistance after the initial low reading is a fundamental characteristic of a healthy capacitor, as it signifies that there is no current flow through the dielectric material of the capacitor, ensuring effective operation in a circuit.

The other responses reflect conditions that do not correspond with the expected behavior of a functioning capacitor. For example, consistent low resistance would suggest the capacitor is shorted, while erratic readings could indicate a faulty capacitor or issues with the testing method. No response at all would not provide valuable information about the capacitor's health. Thus, observing charging current leading to a high steady resistance is the correct interpretation when assessing a good capacitor with an ohmmeter.