Question

state the physical quantity which is equal to the ratio of potential difference and current define its SI unit​

Answer 1

Resistance is that physical quantity.

Ohm is SI unit

Answer 2

Electrical Resistance,

R = V/I

The resistance of a conductor is said to be one ohmn if the potential difference applied across its ends is 1 volt and a current of 1 A flows through it.

Its SI unit is ohm.

1 ohm = 1 volt/1 ampere