Vũ Công Tử

2 năm trước

Cho R1 song song R2 R1=15ôm R2=30ôm U=15V a, Rtđ= ? b,tính cường độ dòng điện c, cho R1,R2 nối tiếp R3. cường độ dòng điện thay đổi (I) =0.75A ; Tìm R3

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Mộng Kiều

2 năm trước

Đáp án:Rtđ = 15+30/15×30=0,1( ôm )

b) cđdđ là:

I=U/Rtđ= 15/0,1=150( A )

Giải thích các bước giải:

thumoc

2 năm trước

a. ${R_{td}} = \frac{{{R_1}.{R_2}}}{{{R_1} + {R_2}}} = \frac{{15.30}}{{15 + 30}} = 10\Omega $

b. $I = \frac{U}{{{R_{td}}}} = \frac{{15}}{{10}} = 1,5A$

c. $\begin{array}{l}
{R_{td2}} = \frac{U}{{{I_2}}} = \frac{{15}}{{0,75}} = 20\Omega \\
{R_{td2}} = {R_{td}} + {R_3}\\
\to {R_3} = {R_{td2}} - {R_{td}} = 20 - 10 = 10\Omega
\end{array}$

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Cho R1 song song R2 R1=15ôm R2=30ôm U=15V a, Rtđ= ? b,tính cường độ dòng điện c, cho R1,R2 nối tiếp R3. cường độ dòng điện thay đổi (I) =0.75A ; Tìm R3

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