Mạch gồm hai bóng đèn Đ1, Đ2 và một biến trở, mắc như trên sơ đồ hình 6.2. Cho biết điện trở lớn nhất của biến trở là 12 Ω, điện trở của mỗi bóng đèn là 3 Ω. Đoạn mạch được nối vào một nguồn điện là 24V. Tính cường độ dòng điện qua Đ1và Đ2 khi: a) Con chạy ở vị trí M
b) Con chạy ở vị trí P, trung điểm của đoạn MN;
c) Con chạy ở vị trí N

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If a stone with an original velocity of 0 is falling from a ledgeand takes 8 seconds to hoybthe ground whays the final velocity of the stone