Question

Cho (r1 nt r2) song song r3 a) biết r1=10 ôm, r2=8 ôm, r3=12 ôm, U=6V. Tính R? Tính U2

Answer 1

\((R_1ntR_2)//R_3\)

\(R_{12}=R_1+R_2=10+8=18\Omega\)

\(R_m=\dfrac{R_{12}\cdot R_3}{R_{12}+R_3}=7,2\Omega\)

\(U_m=6V\Rightarrow U_3=U_{12}=6V\)\(\Rightarrow I_{12}=\dfrac{6}{18}=\dfrac{1}{3}A\)

\(\Rightarrow I_2=I_{12}=\dfrac{1}{3}A\)\(\Rightarrow U_2=\dfrac{1}{3}\cdot8=\dfrac{8}{3}\approx2,67V\)