This is the 827th most frequent Korean word.
전기
The Korean word "전기" means "electricity" or "electrical." It can also mean "biography" depending on context.
전기 in this sentence means 'biography', referring to the life story of a person.
이 책은 유명한 과학자의 전기를 다룬다.
This book discusses the biography of a famous scientist.
전기 here signifies 'electricity', referring to electrical power.
전기를 끄고 외출하세요.
Turn off the electricity before going out.
전기 in this context is part of '전기 자동차', meaning 'electric', as it relates to the type of car.