An efficient voltmeter has:
Correct answer: B. High resistance in comparison to circuit resistance
- A. Low resistance in comparison to circuit resistance
- B. High resistance in comparison to circuit resistance
- C. A resistance equal to circuit resistance
- D. None of the above
Explanation
High resistance in comparison to circuit resistance: This is the correct option. An efficient voltmeter should have a high internal resistance compared to the resistance of the circuit. This prevents significant current flow through the voltmeter, ensuring accurate voltage measurement without affecting the circuit's performance. Therefore, the most efficient voltmeter has high resistance compared to the resistance of the circuit it is measuring.
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
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About Resistance and Resistivity
Resistance measures opposition to current in a conductor and follows R = V/I for an ohmic conductor, while resistivity is an intrinsic property of the material. Questions use R = ρL/A, examine effects of length, cross-sectional area and temperature, and distinguish resistance, resistivity, conductance and conductivity.
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