Home » English riddles » Conceptual Questions » Conceptual Question No.12 – Equipments working in ac power » Reply To: Conceptual Question No.12 – Equipments working in ac power Reply To: Conceptual Question No.12 – Equipments working in ac power 2021-08-03 at 11:08 am #2955 Hamid There aren’t any difference between negative and positive operation sycle in bulb.