07/07/2021

Ohm's Law

 

  • The current flowing through metallic conductor is directly proportional to potential difference across it, provided that the temperature and other physical conditions remains same. 
  • If I is current passes through a conductor and V is potential difference across its terminal, according to ohm’s law

       I α V ( constant temperature )

                 OR

       V α I

      ( V / I ) = Constant

      V = IR

     Where R = Constant, it is called as resistance at given temperature

Resistance

  • It is a property of conductor to oppose the flow of current through it. The SI unit of resistance is ohm.
  • One ohm = One volt / One ampere
  • According to ohm’s law

        V = IR

         I = V / R

  • Therefore we can say that

        I α V  …… ( 1 )

        and I α ( 1 / R ) …… ( 2 )

  • The current passes through conductor is directly proportional to potential difference across it. 
  • The current passes through conductor is inversely proportional to resistance of metallic conductor.

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