Question

what is the convention direction of the flow of electric current how does it differ from the direction of flow of electrons

Answer 1

Current flows between two points with potential difference. We assume that current flows from higher potential to lower potential. This is called conventional current direction. If you decide today that you will treat current to be flowing from negative potential to positive potential, you can follow it. The only requirement is that you must be consistent with that assumption through all your calculations.

That given, understand two points:

All instruments and standards use conventional direction. You may have to convert them to your assumption, before any inference or calculation.Electrons always flow from lower potential to higher potential. So, you can say conventional current direction is always opposite to electron flow direction.

Answer 2

The wire gets hot when an electric current passes through it .this is the heating effect of the electric current