Current is the continuous flow of electrons.
Current can only flow if there the electrons can flow in a closed loop.This closed loop that current flows through is called a Circuit.
This closed loop that current flows through is called a Circuit.Like a light switch,you flick the light switch,the battery powers up,then the light turns on.
Conductors are materials that freely allow the flow of electrons with very little resistance.Conductor is like a light switch.
Semiconductors are materials that do not allow electors to flow freely but do not directly stop them either.
Insulators are materials that greatly impede or stop the flow of electrons with very high resistance.A telephone pole is an example of an insulator.
Voltage is the potential difference in electrical charge between two different areas in a circuit.An electricity box could be an example of Voltage.