*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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