The resistance of a conductor through which a current of one ampere is flowing when a potential difference across its ends is one volt is
Correct answer: B. One ohm
- A. One volt
- B. One ohm
- C. One ampere
- D. One coulomb
Explanation
Ohm (Ω) is the unit of electrical resistance. One ohm of resistance is defined as the resistance of a conductor through which a current of one ampere flows when a potential difference of one volt is applied across its ends. This relationship is described by Ohm's law, which states that the potential difference (V) across a conductor is directly proportional to the current (I) flowing through it, with the constant of proportionality being the resistance (R). Therefore, when a potential difference of one volt is applied across a conductor and a current of one ampere flows through it, the resistance of the conductor is one ohm.
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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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