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dotrang2002008
2 năm trước
Dùng kí hiệu để vẽ sơ đồ mạch điện trong các trường hợp sau : a) Hai pin mắc liên tiếp, một bóng đèn Đ1, một khóa K1 và một số dây dẫn. Sao cho K1 đóng đèn Đ1 sáng b) Hai pin mắc liên tiếp, hai bóng đèn Đ1, Đ2, hai khóa K1, K2 và một số dây dẫn. Sao cho K1 mở K2 đóng chỉ có đèn Đ2 sáng
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