Dimension of electrical resistance is:

Resistance ($R$) is defined by Ohm's Law as:
$$R=\frac{V}{I}$$
Where $V$ is potential difference and $I$ is current.Potential difference $V=\frac{\text{Work}}{\text{Charge}}=\frac{[{\text{ML}}^2{\text{T}}^{-2}]}{[\text{AT}]}$ $
$V=[{\text{ML}}^2{\text{T}}^{-3}{\text{A}}^{-1}]$$Now,$ R = \frac{[\text{ML}^2\text{T}^{-3}\text{A}^{-1}]}{[\text{A}]}
$R = [\text{ML}^2\text{T}^{-3}\text{A}^{-2}]