How to make electricity
Electricity can be made when a wire is moved through a magnetic field.
Winding the wire into a coil can increase the amount of force which pushes electricity through the wire. This force is called voltage.
Both ends of the wire need to be attached to a circuit.
When the coil of wire is rotated within the magnetic field, free electrons run through the coil and around the circuit.

When the coil of wire is connected into an electric circuit (at the terminals A and a) the electrons are under pressure to move in a certain direction and a current will flow. This electrical pressure is called voltage.
A coil of wire moved within a magnetic field causes electrons in the wire to move.
When the wire is connected to an electric circuit, the electrons will be under pressure to move in a certain direction causing an electric current to flow.