A transmission includes shafts, gears and a clutch and is installed between the engine and the driving wheels that allow the engine to be disconnected when the engine ids started and idling and to make the most efficient use of the engine's power under varying loads. There are two types of transmissions - those in which the gears are shifted manually by the driver and those where the gears are shifted automatically by such a device as a hydraulic torque converter. A vehicle is equipped with steering and braking systems to control it while in motion. The steering system comprises of a series of linkages and gears that transmit the movement of the steering wheel to the front wheels. In recent times, disk brakes, in which a clamp squeezes a disk attached to the wheel, are used.
Automobiles use complex electrical systems .
The battery provided enough power to engage the starting motor and to activate the ignition system. When the engine is started, the alternator continually recharges the battery and supplies power to other electrical equipment. Apart from these, there are different subsystems that are equally important. The fuel system provides storage space for the fuel, transports it to the engine, and mixes it with air for combustion in the engine. The exhaust system vents exhaust gases by way of a muffler, which helps reduce engine noise.