An electric current is the flow of electrical charges, typically electrons. When a circuit is complete, charges flow, producing a current. A source of potential difference is also required for current to flow in a circuit. For example, a cell or battery.
The two types of current are:
Charge is the total current that has flowed 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 series circuit, the current is the same at any point.