Amps and current were first thought of with Ben Franklin, so the convention is of positive charge moving.

Ohm’s law is useful when it’s applicable (which is likely throughout this class). V = IR

Power can be a variation of P = I V and power itself is energy divided by time. You can substitute Ohm’s law into that equation for variations.

Opposite charges attract, like charges repel.

Sometimes you will use things like kinematic equations with newer material.