Automobile Engineering in ME
The main task of a battery in automobiles is to

Supply electricity to the vehicle's electrical system at all times while the engine is running
Act as a reservoir or stabilizer of electricity
Supply a large amount of power to turn the starter motor when the engine is being started
Supply electricity to the alternator

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Automobile Engineering in ME
A basic difference between the spark ignition engine and the Diesel engine is that the

Diesel engine compresses air alone instead of an air-fuel mixture
Air temperature ignites the fuel in the Diesel engine
All of these
Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke

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