dairua

2 năm trước

cho mạch điện biết hai bóng đèn Đ1 và Đ2 có hiệu điện thế định mức như sau Uđm1 =9 V,Uđm2 =6V điện trở tương ứng R1 = 7 ôm,R2 = 6 ôm Tính a. điện trở của biến trở khi đèn sáng bình thường ? b.Biến trở lớn nhất là 55 ôm,được quấn bằng dây nicrom có điện trở suất là 1.1x10 ∧-6 có tiết diện 0.2 mm ² .Tính chiều dài của dây này

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quangdoan

2 năm trước

Đáp án:

b, $l=10m$

Giải thích các bước giải:

a, Bạn cần bổ sung giá trị hiệu điện thế nguồn hoặc sơ đồ mạch nhé.

b, Chiều dài dậy

$l=\frac{R.S}{\rho}=\frac{55.0,2.10^{-6}}{1,1.10^{-6}}=10m$

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