A potentiometer is a device for:
Correct answer: A. Comparing two voltages
- A. Comparing two voltages
- B. Measuring current
- C. Comparing two currents
- D. Measuring voltage
Explanation
A potentiometer is an instrument for measuring voltage or 'potential difference' by comparison of an unknown voltage with a known reference voltage.
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About Current Electricity
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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