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uyen511
2 năm trước
Câu 1: Vẽ sơ đồ mạch điện gồm: nguồn điện 2 pin nối tiếp, 1 ampe kế, 1 khóa K (đóng), 1 bóng đèn, các dây dẫn. Hãy xác định các cực của nguồn điện, các chốt của ampe kế và chiều dòng điện trong mạch. Câu 2: Vào những ngày thời tiết hanh khô, khi ta chải đầu bằng lược nhựa, nhiều sợi tóc bị lược nhựa hút kéo thẳng ra. Giải thích vì sao? Câu 3: Đổi đơn vị cho các giá trị sau đây: a) 425 mA = ………… A b) 0,5V = …………. mV c) 220 V = …………. kV d) 0,3A = ………… mA
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