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contact breaker
A contact breaker (or "points") is a type of electrical switch, and the term typically refers to the switching device found in the distributor of the ignition systems of spark-ignition internal combustion engines.
==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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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