Class 12 Chemistry Electrochemistry Electrical resistance

Electrical resistance

  • It is denoted by the symbol R’.
  • It is measured in a unit called ohm (Ω) with the help of a Wheatstone bridge
  • The electrical resistance is:
  1. Directly proportional to its length, l
  2. Inversely proportional to its area of cross section, A.

  • In the equation the constant of proportionality denoted by called rho is called resistivity.
  • It is measured in units called ohm metre.
  • When length = 1m.

Cross sectional area = 1m2

  • Then resistivitybecomes the resistance.

1 Ω m = 100 Ω cm

1 Ω cm = 0.01 Ω m

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