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In a Pre-Electronic Ignition distributor, the "Points" are opened and closed by a rotating cam. This acts as a switch turning 12v on/off to the High Voltage Coil at the proper time.

In an electronic ignition, a solid state circuit (transistors) performs the switching duty, replacing the Points/Cam as a timing circuit.

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Q: What is the cause of on and off electricity in the distributor?
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