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Measurements & InstrumentationBridge Measurements

For a balanced Wheatstone bridge with arms P, Q, R and S arranged in the standard ratio form, the balance condition is?

  • AP/Q = R/S
  • BP+Q = R+S always
  • CPQ = R+S
  • DP/R = Q+S
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Correct Answer: A. P/Q = R/S
Explanation: At balance, no detector current flows and the bridge arm ratios satisfy P/Q=R/S (equivalently PS=QR).
Reference: Standard measurements and instrumentation: bridge measurements
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