# Statement of 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

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.

## Limitation of Ohm’s law

- The ohm’s law is not applicable for non – linear device such as semiconductor material.
- Not applicable for unilateral devices such as PN junction diodes and transistors.
- Th ohm’s law is not applicable for non – metallic conductors.

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