Class 12 Chemistry Electrochemistry Arrangement for measurement of Resistance

Arrangement for measurement of Resistance

  • The arrangement consists of two resistances R3 and R4.
  • There is a variable resistance R1 and a conductivity cell with unknown resistance R2.
  • The Wheatstone bridge is provided with an oscillator O that acts as source of a.c. power.
  • The arrangement has a suitable detector P.
  • The Wheatstone bridge is balanced when there is no flow of current through the detector.

Unknown resistance = R2 = R1R4 /R3

  • After calculating the resistance the conductiviry can be easily calculated using the formula:
  • κ = G' /R

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