Final answer:
An ohmmeter is a device used to measure the resistance of a component or circuit that is not powered. It works by applying a voltage and measuring the resulting current, then calculating the resistance using Ohm's law.
Step-by-step explanation:
An ohmmeter is a device that is used to measure the amount of resistance in a component (or circuit) that is not powered. It works by applying a voltage to the resistance and measuring the current, then calculating the resistance using Ohm's law. The resistance is measured using the formula R = V/I, where V is the voltage and I is the current.