ọkụ ọkụ, nke a na-akpọkarị ọkụ ọkụ, ga-arụ ọrụ dị ka ụda nke elu-voltage piezoelectric mwepu site na elu-voltage lead (ọkụ ọkụ), nke ga-agbaji ikuku n'etiti electrodes nke spark plugs, na-emepụta ọkụ eletrik na-eme ka ọkụ na-ekpo ọkụ na gas mix na cylinder. The isi ọnọdụ nke elu arụmọrụ engine: elu ume kwụsiri ike spark, edo ngwakọta, elu mkpakọ ruru. Ụgbọ ala ndị nwere injin mgba ọkụ nke ime na-ejikarị mmanụ ụgbọala na mmanụ dizel. N'ahịa ụgbọ ala China, ụgbọ ala mmanụ ụgbọala na-ebu oke. Igwe mmanụ ụgbọala dị iche na mmanụ dizel n'ihi na mmanụ ụgbọala nwere ebe mgbanye dị elu (ihe dị ka ogo 400), nke na-achọ ka ọkụ na-amanye na-agbanye ngwakọta. Site na ihapu n'etiti electrodes na-emepụta sparks, mmanụ ụgbọala engine bụ site mmanụ ụgbọala na gas ngwakọta n'oge combustion n'ịwa ike, ma dị ka mmanụ ụgbọala gasoline ọbụna na a elu okpomọkụ gburugburu ebe obibi siri ike na mberede combustion, iji mee ka ya n'oge combustion dị mkpa iji "ọkụ" ọkụ. N'ebe a, mgbanye ọkụ bụ ọrụ "spark plug".
