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Cho mạch điện như hình A/------===R1===------===R2===-----/B Biết R1=5 ôm,R2= 10 ôm a.Tinh R tương đương và cường độ dòng điện chạy trong đoạn mạch AB b. Mắc thêm R3= 15 ôm sống song với R2 +Vẽ sơ đồ đoạn mạch và tính điện trở tương đương của đoạn mạch khi đó +Tính cường độ dòng điện chạy qua mạch chính khi đó

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thumoc

a. \(\begin{array}{*{20}{l}}
{{R_{td}} = {R_1} + {R_2} = 5 + 10 = 15\Omega }\\
{I = \frac{U}{{{R_{td}}}} = \frac{U}{{15}}A}
\end{array}\)

b. \(\begin{array}{l}
{R_{23}} = \frac{{{R_2}.{R_3}}}{{{R_2} + {R_3}}} = \frac{{10.15}}{{10 + 15}} = 6\Omega \\
{R_{td2}} = {R_1} + {R_{23}} = 5 + 6 = 11\Omega \\
I = \frac{U}{{{R_{td2}}}} = \frac{U}{{11}}A
\end{array}\)

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