Giúp mình đi ạ
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TN
1
10 tháng 10 2021
a) \(R_{tđ}=\dfrac{1}{\dfrac{1}{R_1}+\dfrac{1}{R_2}+\dfrac{1}{R_3}}=\dfrac{1}{\dfrac{1}{3}+\dfrac{1}{6}+\dfrac{1}{4}}=\dfrac{1}{\dfrac{3}{4}}=\dfrac{4}{3}\left(\Omega\right)\)
b) Do mắc song song nên \(U=U_1=U_2=U_3=12V\)
\(\left\{{}\begin{matrix}I_1=\dfrac{U_1}{R_1}=\dfrac{12}{3}=4\left(A\right)\\I_2=\dfrac{U_2}{R_2}=\dfrac{12}{6}=2\left(A\right)\\I_3=\dfrac{U_3}{R_3}=\dfrac{12}{4}=3\left(A\right)\end{matrix}\right.\)
giải giúp mình câu 1 đi ạ gấp ạ
24 B
25 A
26 B
27 B
28 B
29 B
30 A
III
1 A
2 D
3 C
4 ko thấy lỗi
5 to read => reading
B
1 The alarm goes off at 4.30, I get up and go to the kitchen to boild some water for my morning tea
2 I plough and harrow my plot of land at a quater to eight and then I take a short rest
3 Last year I spent my summer holidays in a seasides town
C
1 has been built across the river
2 has been set up into space
3 have been cut down for wood by farmers
4 have been killed in the forst fire
5 one hundres building and houses in the earthquake have been destroyed