Typical examples include safety belts and airbags. The spark plug converts high voltage energy into an arc that passes between its electrodes. The arc causes the gasoline-air mixture in the cylinder to ignite and expand, providing power by pushing down the piston. Starter A motor powered by the battery that rotates the crankshaft before the engine is started. Steering, Power Assist provided by the engine to reduce steering effort.
Power steering is essential to make large, heavy vehicles manageable.
Small vehicles often do not require power steering. Steering, Rack and Pinion A common steering type. The steering wheel is connected to a pinion gear that meshes with a rack, or linear gear. As the pinion rotates, the rack moves side to side, this moves the steering linkage, causing the wheels to pivot left or right. A device that compresses air before the engine receives it.