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2 năm trước
Quan sát sơ đồ nguyên lí mạch điện một công tắc ba cực điều khiển hai đèn và cho biết: a. Mạch điện gồm những phần tử nào? Các phần tử mắc với nhau bằng cách mắc gì? ( nối tiếp hay song song, chỉ rõ.): 3 điểm b. Nêu nguyên lí làm việc của mạch điện? 4 điểm ( Gợi ý trả lời: quan sát sơ đồ cho biết đèn nào đang sáng, Đ1 hay Đ2? Muốn đèn còn lại sáng phải làm thế nào? Muốn cả hai đèn tắt phải làm thế nào?) c. Công tắc CT1 giữ chức năng gì trong mạch điện?
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