Question

Define ohms law and derive it

Answer 1

hey there!

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Statement:– Ohm’s law states that the current (I) flowing through a conductor is directly proportional to the potential difference (V) across the ends of the conductor,provided physical conditions of the conductors such as temperature,mechanical strain etc. Are kept constant i.e. IαV

Or VαI or V= RI

Or V/I=R=a constant

Where R is known as resistance of the conductor . It depends upon the length ,shape and the nature of the material of the conductor. The variation between potential difference (V) and current (I) through a conductor is a straight line.

Deduction of Ohm’s Law:

As drift velocity is given by V

d=eEt/m

But Electric field across the conductor of length l is

E=V/l

Thus V

d=e V/ml

Also, I=Anev

By putting value of v

in the equation of I (equation 1 of relation of the current and drift velocity),we get

I=Ane(eV/ml)=(Ane^22/ml)V

Or V/I=ml/Ane^2=R

Where R is a constant for a given conductor. It is known as the resistance of the conductor.

Thus V=RI

This is Ohm’s law.

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hope it helps!

Answer 2

Heya mate
Here is ur answer

Ohms law :Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

Ohm's law states that at a constant temperature, current I through a conductor between two points is directly proportional to the potential difference or voltage, V, across
the two points. Thus, the ratio V: I is constant, and is called the resistance, R, of the conductor.

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