A spark plug is an essential component in internal combustion engines. Let’s dive into its design and function:
Design:
A spark plug consists of several key elements:
Shell: The outer casing that passes through the wall of the combustion chamber.
Insulator: Typically made from sintered alumina (Al₂O₃), a hard ceramic material with high dielectric strength.
Central Electrode: Connected to the terminal through an internal wire. It serves as the cathode from which electrons are ejected. The sharp tip of the central electrode increases the electrical field strength, aiding electron emission.
Side Electrode (Ground Strap): Made from high-nickel steel, it is welded or hot forged to the side of the metal shell.
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