Why does current increase when voltage increases?

As voltage increases the energy of electrons increases and due to which it's drift velocity also increases and the rate of passing electrons through the conductor increases which is cause of current flowing and due to this increase in rate of flow , the current also increases..

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.