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| POWER SYSTEM | |
Gasoline internal-combustion engines power most automobiles, but some engines use diesel fuel, electricity, natural gas, solar energy, or fuels derived from methanol (wood alcohol) and ethanol (grain alcohol). Most gasoline engines work in the following way: Turning the ignition key operates a switch that sends electricity from a battery to a starter motor. The starter motor turns a disk known as a flywheel, which in turn causes the engine’s crankshaft to revolve. The rotating crankshaft causes pistons, which are solid cylinders that fit snugly inside the engine’s hollow cylinders, to move up and down. Fuel-injection systems or, in older cars, a carburetor deliver fuel vapor from the gas tank to the engine cylinders. The pistons compress the vapor inside the cylinders. An electric current flows through a spark plug to ignite the vapor. The fuel mixture explodes, or combusts, creating hot expanding gases that push the pistons down the cylinders and cause the crankshaft to rotate. The crankshaft is now rotating via the up-and-down motion of the pistons, permitting the starter motor to disengage from the flywheel. |
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PUBLIC TRANSPORTATION: • TYPES OF PUBLIC TRANSPORTATION • Buses • Paratransit • Streetcars • Light-Rail Transit • Heavy-Rail Transit • Commuter Rail Transit • Automated Guided Transit • Ferries • DEVELOPMENT OF PUBLIC TRANSPORTATION IN THE UNITED STATES • HISTORY TRUCK: • LIGHT TRUCKS • MEDIUM TRUCKS • HEAVY TRUCKS • TRAILERS • TRUCKING OPERATIONS AND REGULATIONS • HISTORY |
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