An electric current is the flow of electrical charge (electrons). When a circuit is complete, charge is flowing and there is a current. A source of potential difference is also required for current to flow in a circuit. For example a cell or battery.
Current always flows from positive to negative. However, the charged particles sometimes flow in the reverse direction.
The two types of current are:
Charge is the total current flowing past a point over a period of time. To calculate the electrical charge flowing through a given point, over a period of time, we use the equation:
In a closed-loop circuit, the current is the same at any point.