How can a spark plug fire so precisely and reliably?

Question

Iv used those cheap lighters that use a quick spark to ignite the gas, but after a couple weeks they die out. How are the ones in engines so reliable and last for so long?

Furthermore, how can they fire at JUST the right time, thousands of times a second?

Thanks in advance

In: Engineering

Answer 1

Clicky thingy has moving parts that wear out. Spark plug has no moving parts. It’s also designed to take the high temperatures in the cylinder.