What is a Spark Plug?

[Millard]

Spark plug is a device used in gasoline engines to ignite the air-fuel mixture. Its components include: an outer ceramic insulator, a central metal conductor, and internal electrodes. Types of spark plugs include: 1. Standard spark plugs; 2. Projected insulator spark plugs; 3. Electrode spark plugs; 4. Seat-type spark plugs; 5. Pole-type spark plugs; 6. Surface-gap spark plugs. The working principle of a spark plug is: under the control of the engine, it introduces the high voltage electricity generated by the ignition coil into the engine cylinder, creating a spark between the spark plug electrodes to ignite the air-fuel mixture, enabling the engine to operate normally.