The electrical device used to measure the value of an unknown resistance is a
Correct answer: D. Wheatstone bridge
- A. rheostat.
- B. voltmeter
- C. galvanometer
- D. Wheatstone bridge
Explanation
The correct answer is the Wheatstone bridge because it is a device commonly used to measure unknown resistance values accurately. The Wheatstone bridge works by balancing the ratio of resistances in its circuit, allowing for precise resistance measurements. The other options, such as the rheostat, voltmeter, and galvanometer, serve different functions in electrical circuits and are not suitable for measuring unknown resistances.
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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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