The spark plug is the heart of the engine

1. What is a spark plug?
The spark plug is the heart of the engine and plays the role of ignition several to dozens of times per second. It can be compared to the function of the human heart and plays the role of "pacing".
Generally speaking, each cylinder of a common engine has a spark plug. Each spark plug ignites the mixture of gasoline and air at the moment of high-voltage electric spark discharge. Since the ignition moment is too short, the energy of the fuel cannot be replaced. Release more and use it.
A gasoline engine cannot work without a spark plug.
2. Efficiency of heat engine
According to junior high school physics textbooks, the thermal efficiency of a gasoline engine is 20%-30%.