What is an ohmmeter?

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Study for the Con Edison Basic Electric Test. Prepare with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

What is an ohmmeter?

Explanation:
An ohmmeter is a device used to measure resistance, the opposition to current flow, in ohms. It works by applying a small internal current to the component and measuring the resulting voltage drop (or vice versa), then using Ohm’s law to display the resistance value. Because it needs its own power source to drive that test current, you should test a component with the circuit de-energized and isolated to avoid inaccurate readings or damage. This distinguishes it from instruments that measure voltage or current, and it isn’t a device for storing energy. So, the function is specifically to determine resistance in ohms.

An ohmmeter is a device used to measure resistance, the opposition to current flow, in ohms. It works by applying a small internal current to the component and measuring the resulting voltage drop (or vice versa), then using Ohm’s law to display the resistance value. Because it needs its own power source to drive that test current, you should test a component with the circuit de-energized and isolated to avoid inaccurate readings or damage. This distinguishes it from instruments that measure voltage or current, and it isn’t a device for storing energy. So, the function is specifically to determine resistance in ohms.

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