What is the SI unit for resistance?

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Prepare for the Electrical Academy Level 1 Test. Study with multiple choice questions, flashcards, and detailed explanations. Assess your knowledge and ace the exam!

Multiple Choice

What is the SI unit for resistance?

Explanation:
Resistance is the measure of how much a component impedes electric current. In SI units, this quantity is the ohm, symbolized by the Greek letter omega (Ω). The ohm is defined as the resistance between two points of a conductor when a constant potential difference of one volt, applied to these points, produces a current of one ampere, with no electromotive force generated by the conductor itself. In practical terms, the relationship between voltage, current, and resistance is V = IR, so the unit of R is volts per ampere (V/A), which is the ohm. So if 1 volt across a device drives 1 ampere through it, its resistance is 1 ohm. The other units listed correspond to voltage (volt), current (ampere), and capacitance (farad), not resistance.

Resistance is the measure of how much a component impedes electric current. In SI units, this quantity is the ohm, symbolized by the Greek letter omega (Ω). The ohm is defined as the resistance between two points of a conductor when a constant potential difference of one volt, applied to these points, produces a current of one ampere, with no electromotive force generated by the conductor itself. In practical terms, the relationship between voltage, current, and resistance is V = IR, so the unit of R is volts per ampere (V/A), which is the ohm. So if 1 volt across a device drives 1 ampere through it, its resistance is 1 ohm. The other units listed correspond to voltage (volt), current (ampere), and capacitance (farad), not resistance.

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