Basically a potentiometer is a device for:
Correct answer: A. Comparing two voltages
- A. Comparing two voltages
- B. Measuring a current
- C. Comparing two currents
- D. Measuring a voltage
Explanation
A potentiometer works on the principle of null deflection and is mainly used to compare an unknown voltage with a known standard voltage without drawing current from the source.
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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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