What is the unit of resistance?

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Study for the IGCSE Physics Electricity. Study 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 tells us how much a component opposes the flow of current. The unit used for this is the ohm, symbol Ω, defined as one volt per ampere. This comes from Ohm’s law, R = V / I, so the unit of resistance is volts per ampere, i.e., an ohm. The other quantities have different units: current is amperes, potential difference is volts, and power is watts. So the unit of resistance is the ohm.

Resistance tells us how much a component opposes the flow of current. The unit used for this is the ohm, symbol Ω, defined as one volt per ampere. This comes from Ohm’s law, R = V / I, so the unit of resistance is volts per ampere, i.e., an ohm. The other quantities have different units: current is amperes, potential difference is volts, and power is watts. So the unit of resistance is the ohm.

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