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Residuals in a bridge arm mean

  • A.the currents left circulating in the network after the detector has been nulled
  • B.the harmonic content of the supply that a tuned detector is unable to reject
  • C.the difference between the two balance readings taken with the supply reversed
  • D.the small unwanted reactance a nominally pure resistor possesses

Answer: D

A wire-wound resistor has self inductance and self capacitance, and a capacitor has lead inductance and dielectric loss. At audio frequencies these residuals are small but not negligible, and precision work either allows for them or uses arms specially constructed to minimise them.

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