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deduce ohm's law from elementary ideeas and write an expression for resistance and resistivity

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6,391 views asked May 30, 2017 in Physics by abhisheksingh (120 points)

1 Answer

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Ohm's law can be deducaed from the relation I = nAev

where I  is the current, n is the no. of free electrons per unit volume of the conductorf, A is the area of cross section of the conductor, e is the electronic charge and v is the drift velocity of the free electron

substituting for v in the equation,

 we get 

which shows that

 since is a constant. Hence Ohm's law.

.

Resistance 

Resistivity

answered Jun 1, 2017 by admin (4,920 points)

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