A potentiometer cannot be tested with which of the following?

A potentiometer is an adjustable resistor that can vary its resistance, commonly used in applications such as volume controls and tuning circuits. To test a potentiometer, you would typically use a multimeter to measure its resistance at different settings, an oscilloscope to analyze voltage changes, or an ammeter to measure current flow indirectly through the potentiometer in a circuit.

A test light relies on significant current flow to illuminate, and since a potentiometer alters resistance to adjust voltage or current levels, it does not provide the type of measurable current that would trigger a test light effectively. Therefore, a test light is not an appropriate tool for testing a potentiometer, because it requires a certain amount of current to function that may not be present depending on the potentiometer’s settings and circuit connections. This is why it cannot be used to accurately test a potentiometer.