cho 2 dien tro R1=R2=R mac vao hai diem A,B. Goi dien tro cua doan mach AB khi R1 noi tiep voi R2 la Rab, dien tro cua doan mach khi R1//R2 la R’ab. H

Question

cho 2 dien tro R1=R2=R mac vao hai diem A,B. Goi dien tro cua doan mach AB khi R1 noi tiep voi R2 la Rab, dien tro cua doan mach khi R1//R2 la R’ab. Hay tim ti so Rab/R,ab

in progress 0
Adalyn 2 tháng 2021-10-28T20:21:27+00:00 1 Answers 7 views 0

Answers ( )

    0
    2021-10-28T20:22:41+00:00

    Đáp án:

     4

    Giải thích các bước giải:

    $\begin{array}{l}
    {R_1}nt{R_2} \Rightarrow {R_{ab}} = {R_1} + {R_2} = 2R\\
    {R_1}//{R_2} \Rightarrow {R_{ab}}’ = \frac{{{R_1}{R_2}}}{{{R_1} + {R_2}}} = \frac{{{R^2}}}{{2R}} = \frac{R}{2}\\
    \frac{{{R_{ab}}}}{{{R_{ab}}’}} = \frac{{2R}}{{\frac{R}{2}}} = 4
    \end{array}$

Leave an answer

Browse

35:5x4+1-9:3 = ? ( )