Ma ọ bụ nkwakọ ngwaahịa nri, nkwakọ ngwaahịa ahụike ma ọ bụ mkpuchi ngwaahịa elektrọnik na eletriki yana mkpa ịkpụzi rọba ndị ọzọ, anyị nwere ike ịnye ihe ngwọta ahaziri iche iji nyere ndị ahịa aka imepụta ngwa ọrụ nke ọma, ziri ezi na kwụsiri ike.
GỤKWUO