Question

what is charge by convention​

Answer 1

Answer:

By convention, the electric current direction is the direction which positive charge would move. In wires, the actual charge carriers are negatively charged electrons. Nonetheless, the convention used for the direction of current is based on the direction which positive charges would move.

Answer 2

Answer:

By convention, the charge of an electron is negative, −e, while that of a proton is positive, +e.

Explanation:

Charged particles whose charges have the same sign repel one another, and particles whose charges have different signs attract.