Answer / vidya

The battery in a (gasoline powered) car stores the power needed to start the car, and to power electrical accesories when the engine is not running. Once the engine is started, the electrical load is mostly covered by the cars generator or alternator system. In theory, one could disconnect the battery of a running car and not notice any difference. However, the modern car has computers and sensitive electronics which may be at risk without the stabilizing effect of the battery.

Answer / sanju

Because it produces sparks.

Answer / ravichandra

there are many number of applications for using a battery
in a motor car.One such application is to produce ignition.
and to backup the electric equipment, as signal
light,horn,break lights etc when the engine is not running.

Answer / thiruvengadesh

mostly batteries are used to start the vechicles and main
reason is the energy generated by engine is not sufficient
and cannot be used directly.so we used secondary power
system has battery.

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