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Chapter 6 Cranking, Charging and Electrical Auxiliary Systems Parts to Know-Page 1 Alternator: An electrical generator or dynamo for producing alternating current (See generator) Diode: Solid-state component which permits current to flow through in one direction. Fuse: A device designed to open the circuit when a specific current has been exceeded Generator: Any machine by which mechanical energy is changed into electrical energy. Helix Gear: A gear with inclined plane teeth on the outer part made to mate with internal gears on a pinion gear. Ohmmeter: An instrument that has its own source of power and used to measure resistance in ohms on disconnected electrical resistors. ` Overcurrent Protection Device: a device designed to open a circuit when a specific current has been exceeded. (May be a “one time” blow fuse or re-setting) Pinion Gear: A gear with inclined plane teeth on the inner part made to mate with external gears on a helix gear. It is used on starters to move inwardly and drive the ring gear of the flywheel. Rectifier Regulator: A solid-state automatic device used to rectify AC current to DC currents and to regulate voltage. Chapter 6, Cranking, Charging and Electrical Auxiliary Systems, Parts to Know-Page 2 Ring Gears: Teeth cut into the outside of a housing or drive unit. It normally has external teeth and in small engines is found on the rim of the flywheel. Starter: A system for rotating the engine to produce compression and ignition spark for combustion of the air-fuel mixture. Stator: The part of an alternator or generator’s magnetic structure that does not rotate. Voltage Regulator: An automatic device used to regulate voltage to a battery so the battery will not be overcharged.