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Which of the following is NOT a source of error peculiar to alternating bridge work?

  • A.residual reactance in resistors that are nominally pure resistances
  • B.thermoelectric emf at the junctions of the arms
  • C.stray capacitance from the arms and leads to earth and to one another
  • D.mutual inductance between the coils forming the arms of the network

Answer: B

Thermal emf is a direct voltage and troubles direct current work, particularly low-resistance measurement, where the current is reversed to cancel it. An alternating detector ignores it entirely. Strays, mutual inductance and residuals are the characteristic alternating current difficulties.

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