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2 năm trước
Cho hai điện trở R1 và R2 (R1>R2). Khi mắc nối tiếp hai điện trở trên thì được đoạn mạch có điện trở 18 Ω, khi mắc song song hai điện trở trên thì được đoạn mạch có điện trở 4 Ω. Giá trị của R1 bằng A: 4 Ω. B: 6 Ω. C: 10 Ω. D: 12 Ω.
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