Which of the following is the correct relation of Ohm's law?

All of these

In 1827, a German physicist Georg Simon Ohm (1787–1854) found out the relationship between the current I, flowing in a metallic wire and the potential difference across its terminals.

The potential difference, V, across the ends of a given metallic wire in an electric circuit is directly proportional to the current flowing through it, provided its temperature remains the same. This is called Ohm’s law.

In other words

V ∝ I

or V/I = constant = R

or V = IR

According to Ohm’s law, R = \(\frac{V}{I}\)

or I = \(\frac{V}{R}\)