Question

Define the unit of resistance?

Answer 1

1. Resistance is the obstruction posed by the conductor to the flow of electrons.
2. The SI unit of resistance is the $\mathrm{ohm}$.
3. By Ohms law, $V=IRorR=\frac{V}{I}$
4. $$\begin{gathered} If,V=1VandI=1A, \\ R=\frac{1V}{1A}=1ohm \end{gathered}$$

Hence, one ohm is the resistance offered by a conductor when the current passing through it is one ampere and the potential difference across its ends is one volt.