A spark plug is an electrical device used in internal combustion engines for igniting fuels using an electric spark. They allow fuel to burn and release energy which will cause the moment of the vehicle. These components are having two functions. In addition to igniting the fuels, they will remove the heat also.
The various parts that are present in a plug are
3. Ring, Parking Washer
5. Center Shaft
6. Glass Seal
7. Electrode with Copper
9. Center Electrode
10. Ground Electrode
Copper spark plugs, Iridium spark plugs and single platinum spark plugs are the types of spark plugs that are available.
These devices will have an insulated centre electrode. In addition to this, one or more ground electrodes are available on the bottom end. There will be a gap between these two electrodes which is known as the spark gap. Once the voltage is supplied from the ignition coil to the spark plug,the electrical energy will jump the gap and produces a spark.
The voltage should be high enough to produce the spark. As the voltage rises, the structure of the fuel between the electrodes begins to change. Once the voltage is more than the dielectric strength of the fuels, it becomes ionized. This ionized gas allows electrons to flow across the gap between the electrodes. The voltage that is normally required is more than 2000 volts. At this voltage, the electrons in the gap will increase causing the temperature of the spark channel to increase. Then the ionised gas expands and will cause a small explosion in the chamber.