Paragraph on “Automobiles Technology” complete paragraph for Class 9, Class 10, Class 11 and Class 12

Automobiles Technology

The first cars were developed in the 18th century with steam engines. Modern day cars have internal combustion engines which comprise of a number of air tight chambers in which a series of flat topped pistons are located. The lower end of these pistons is connected to a shaft which allows them to move up or down within the cylinder. A mixture of petrol and air is sprayed into the cylinder, as the piston moves upwards, it compresses the air and it is ignited by a spark plug, this results in an explosion within the cylinder which pushes the piston downwards thus moving the shaft underneath. The lower shaft called the Crank Shaft, is so shaped that while one piston is pushed down, another one gets pushed up, a similar explosion takes place in this chamber thus pushing this piston down, a cycle of these produces motion. The shaft is connected to wheels which move the vehicle. Speed is controlled with an accelerator pedal under the driver’s foot and transmission of speed through a series of gears in the gear box.