Think of electrical resistance like walking through a crowded corridor; if the people (atoms) start running around frantically due to heat (temperature), it becomes much harder for you (electrons) to walk through at a steady pace.

Ohm's Law: V = IR (Very Important Resistance)

The resistance of a metallic conductor is given by $R = \frac{ml}{ne^2 \tau A}$, where $m$ is the mass of the electron, $l$ is length, $n$ is electron density, $e$ is charge, $A$ is area, and $\tau$ is the relaxation time. As temperature increases, the thermal vibrations of the lattice increase, leading to frequent collisions of electrons and a decrease in $\tau$, which causes $R$ to increase, thereby violating the proportionality.

Always remember that Ohm's law is an empirical law; it is not a fundamental law of nature like Newton's laws, which is why it holds only under specific conditions (constant physical state).