What is the unit of resistance?

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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 the unit of resistance?

Explanation:
Resistance is the opposition to current flow in an electrical circuit, and its unit is the ohm, symbolized by Ω. By Ohm’s law, V = I R, so one ohm equals one volt per ampere. That means if you push one ampere of current with a one-volt difference, you’re facing one ohm of resistance. The other units measure different things: volts are electrical potential difference, amperes are current, and watts are power. Resistors are typically rated in ohms (and sometimes kilo-ohms), and you’d use an ohmmeter to measure this resistance.

Resistance is the opposition to current flow in an electrical circuit, and its unit is the ohm, symbolized by Ω. By Ohm’s law, V = I R, so one ohm equals one volt per ampere. That means if you push one ampere of current with a one-volt difference, you’re facing one ohm of resistance. The other units measure different things: volts are electrical potential difference, amperes are current, and watts are power. Resistors are typically rated in ohms (and sometimes kilo-ohms), and you’d use an ohmmeter to measure this resistance.

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