The SI unit of resistance is
Correct answer: A. Ohm
- A. Ohm
- B. Ampere
- C. Volt
- D. Joule
Explanation
The ohm (symbol: Ω) is the SI unit of electrical resistance. It measures how much a material opposes the flow of electric current. One ohm is defined as the resistance between two points of a conductor when a constant potential difference of 1 volt, applied across these points, produces a current of 1 ampere.
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Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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