"Are 60w & 85w power adapters safe to use on MacBook Air?"に関する回答A related issue - these macbook power supplies are 'class 1' They have two parts: the supply itself and a lead/plug that connects it to the mains/wall socket. The slotted bit that slides onto the supply has metal sides that make the earth connection to the round metal stud on the supply. That's fine however ipad/iphone power supplies use the same connection method except ipad/phone supplies are class 2 and don't have an earth. On the mains plug part that comes with these the slot is all plastic ie no earth connection is possible. The above macbook supplies will fit these just the same. They need an earth but they won't get one!!!!