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Breaker arm with contact points at the left. The pivot is on the right and the cam follower is in the middle of the breaker arm. A contact breaker (or "points") is a type of electrical switch, found in the ignition systems of spark-ignition internal combustion engines. The switch is automatically operated by a cam driven by the engine.
The breaker points (called "Contact breaker" in the figure) are an electrical switch opened and closed by a cam on the distributor shaft. This is timed so the points are closed for the majority of the engine cycle, allowing current to flow through the ignition coil, and are opened momentarily when a spark is desired.
An automotive wiring diagram, showing useful information such as crimp connection locations and wire colors. These details may not be so easily found on a more schematic drawing. A wiring diagram is a simplified conventional pictorial representation of an electrical circuit. It shows the components of the circuit as simplified shapes, and the ...
Older distributor designs used a cam on the distributor shaft that operates the contact breaker (also called points). Opening the points causes a high induction voltage in the ignition coil. [ 1 ] This design was superseded by an electronically controlled ignition coil with a sensor (usually Hall effect or optical) to control the timing of the ...
Points bounce is a feature of a points-triggered system. In the standard system with points, distributor, ignition coil, ignition (Kettering system) points bounce prevents the coil from saturating fully as RPM increases resulting in a weak spark, thus limiting high speed potential. In a CD ignition, at least those early attempts, the points ...
An ignition magneto also includes an electrical transformer, [2] which converts the electricity to a higher voltage (with the trade-off being a corresponding reduction in the output current). [2] As the points begin to open, point spacing is initially such that the voltage across the primary coil would arc across the points.
Comparison of pictorial and schematic styles of circuit diagrams Common schematic diagram symbols (US symbols) The circuit diagram for a four-bit TTL counter, a type of state machine. A circuit diagram (or: wiring diagram, electrical diagram, elementary diagram, electronic schematic) is a graphical representation of an electrical circuit.
A reference designator unambiguously identifies the location of a component within an electrical schematic or on a printed circuit board.The reference designator usually consists of one or two letters followed by a number, e.g. C3, D1, R4, U15.