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Trần Thị Linh
2 năm trước

Cho đoạn mạch gồm 3 điện trở r1=8 ôm ,r2=?,r3=4 ôm được mắc nối tiếp với nhau và mắc vào nguồn điện có hiệu điện thế U=48V CĐDĐ chậy qua r1 là 2A. A, tính Rtđ của đoạn mạch. b, tính R2

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quangdoan
2 năm trước

Đáp án:

$R_{tđ}=24A$

 $R_2=12\Omega$ 

Giải thích các bước giải:

a, $R_{tđ}=\frac{U}{I}=\frac{48}{2}=24A$

b, $R_2=R_{tđ}-R_1-R_3=24-8-4=12\Omega$ 

bn95183
2 năm trước

Đáp án:

 

Giải thích các bước giải:

 

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