When a conducting wire moves inside a magnetic field OR a magnetic field changes
around a conducting wire, an electric current is induced inside the wire – this is called
electromagnetic induction. The size of the induced current depends upon the rate of
cutting of magnetic flux (field) lines.
• Simple a.c. electric generators work as a result of electromagnetic induction. The
output of the generator (current or voltage) is proportional to the speed of rotation
and the number of turns – and increases with the strength of the magnetic field.
• The direction of the induced current in a generator depends upon the direction of the
magnetic field and the direction of rotation of the coil. The direction of the induced
current can be determined by using the fingers on your right hand (sometimes called
Fleming’s Right Hand Rule).
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