Purpose
The purpose of the contact breaker is to interrupt the current flowing in the primary circuit of the ignition coil. When this occurs, the collapsing current induces a high voltage in the secondary winding of the coil, which has many more windings. This causes a very high voltage to appear at the coil output for a short period - enough to arc across the electrodes of a spark plug.
Read more about this topic: Contact Breaker
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