Wheatstone Bridge is used to:
Correct answer: A. Compare resistances
- A. Compare resistances
- B. Determine the current
- C. Determine the charge
- D. Determine the e.m.f
Explanation
The Wheatstone bridge is used for the precise measurement of low resistance. Wheatstone bridge and an operational amplifier are used to measure physical parameters such as temperature, light, and strain. Quantities such as impedance, inductance, and capacitance can be measured using variations on the Wheatstone bridge.
This question appeared on the HEC Phase I 2017 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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