Canja wutar lantarki shine amfani da kayan haɗin lantarki na lantarki kamar transistor, bututun tasirin filin, mai sarrafa siliki mai sarrafa thyratron, da sauransu, ta hanyar da'irar sarrafawa, na'urori masu sauyawa na lantarki koyaushe "a kunne" da "kashe", suna yin na'urar sauyawa ta lantarki. .
Kara karantawa