Which device is used to measure the potential difference between two points of a conductor in the laboratory?
Correct answer: D. Potentiometer
- A. Galvanometer
- B. Ohmmeter
- C. Ammeter
- D. Potentiometer
Explanation
A potentiometer is an instrument for measuring voltage or 'potential difference' by comparison of an unknown voltage with a known reference voltage. A galvanometer and ammeter are both used to measure current, while an ohmmeter measures resistance.
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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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