This lesson discusses two types of current flows:

1. Convectional current direction: the flow of positive charges from the positive terminal towards the negative terminal round the circuit.
2. Electron flow: the flow of negative charges from the negative terminal towards the positive terminal round the circuit.

The lesson also discusses two types of electric circuits:

1. Series circuits where the electric current is the same at every point.
2. Parallel circuits where the electric current divides at the junction such as the total current provided by the power supply is equal to the sum of individual current in the paths.