Current is the flow of charges. Now, when electric current was discovered, electrons werewas thought to be the flow of positive charges. However, after the discovery of electrons it was known that current is the flow of electrons. But, convention was not discarded and both the currents were defined. Hence, electric current is the flow of electrons in a circuit. It is directed from the negative terminal to the positive terminal. Conventional current on the other hand is the flow of positive charges and is directed from positive terminal of the battery to the negative terminal. The arrow in a circuit diagram always shows the conventional current.