If an electrical conductor moves relative to a magnetic field or if there is a change in the magnetic field around a conductor, a potential difference is induced across the ends of the conductor. If the conductor is part of a complete circuit, a current is induced in the conductor. This is called the generator effect. • An induced current generates a magnetic field that opposes the original change, either the movement of the conductor or the change in magnetic field. • Students should be able to recall the factors that affect the size of the induced potential difference/induced current. • Students should be able to recall the factors that affect the direction of the induced potential difference/induced current. • Students should be able to apply the principles of the generator effect in a given context.