A capacitance checker is used specifically to test which component?

A capacitance checker is specifically designed to measure the capacitance value of capacitors. This tool allows technicians to determine if a capacitor is functioning within its rated specifications or if it has degraded over time. Capacitors store electrical energy in an electric field and are characterized by their capacitance, which is measured in farads.

In the context of electrical circuits, capacitors play a vital role in various applications, such as filtering, smoothing, and timing. Knowing the capacitance value helps in diagnosing issues within electronic devices and ensures that circuits perform correctly. Using a capacitance checker on other components, like resistors, transformers, or inductors, would not provide meaningful information about their function or performance, as these components operate on different principles and do not have a capacitance measurement associated with them. Hence, the correct association of a capacitance checker is explicitly with capacitors.