If two coils (known as the primary and secondary) are wound on to the same
iron core then any change in magnetism of one coil will induce a voltage into
the other. This happens when a current is switched on and off to the primary
coil. If the number of turns of wire on the secondary coil is more than the
primary, a higher voltage can be produced. This is called transformer action
and is the principle of the ignition coil.
The value of this ‘mutually induced’ voltage depends upon:
• The primary current.
• The turns ratio between the primary and secondary coils.
• The speed at which the magnetism changes. ...
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