0 Bindigu masu cajin abin hawan lantarki suna aiki azaman kayan aiki masu mahimmanci don ƙarfafa motocin lantarki. Waɗannan bindigogi da gaske suna aiki azaman hanyar shiga tsakani tsakanin kayan aikin caji da baturi mai cajin abin hawa na lantarki. Don tabbatar da daidaito da amincin haɗin gwiwa tsakanin tarin caji da bindiga, gwamnati ta ɗora ƙa'idodi na wajibi, tare da ɗaure duk masana'antun caji da masu kera motocin lantarki don bin waɗannan ƙayyadaddun bayanai.
An raba bindigar caji zuwa ga haɗin gwiwa 7 don tarin AC da haɗin gwiwa 9 don tarin DC. Kowane haɗin gwiwa yana nuna madaidaicin tushen wutar lantarki ko siginar sarrafawa, tare da ƙayyadaddun ƙa'idodi da aka tsara a cikin ƙa'idodin ƙasa.
A tsakiyar wata mota mai cajin bindiga tana kwance akwatin sarrafawa, wani da alama ba a iya gani ba shine fasahar gidaje mai mahimmanci. A cikin wannan akwatin sarrafawa akwai abubuwa da yawa waɗanda ke daure da haƙƙin ƙirƙira, suna nuna mahimmancin sa a cikin tsarin caji.