How many spark plugs does a car generally use?

[LeJayce]

Normally, a car has as many spark plugs as it has cylinders, following the principle of one spark plug per cylinder. The spark plug is a crucial component of the gasoline engine's ignition system. It introduces high-voltage electricity into the combustion chamber, causing it to jump across the electrode gap and generate a spark, thereby igniting the combustible air-fuel mixture in the cylinder. Spark plugs are installed on the side or top of the engine. In earlier models, spark plugs were connected to the distributor via ignition cables. Over the past decade, most passenger car engines have transitioned to direct connection between the ignition coil and the spark plug. Working principle of spark plugs: The ground electrode of a spark plug is connected to the metal shell, which is in turn connected to the engine block via threads on the cylinder head. The insulator primarily serves to isolate the metal shell from the central electrode. The terminal nut is the part of the spark plug that contacts the high-voltage coil. When current passes through the terminal nut and the central electrode, it breaks down the medium between the central electrode and the ground electrode, generating a spark that ignites the air-fuel mixture in the cylinder.