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بوسى
منذ 8 سنوات
اجابة 1
مشاهدة
101
اجابة (1)
I\ =\ \frac{\ VB}{R+r}
\ \frac{1}{2}=\frac{VB}{2+r}\therefore\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \left(1\right)
\ \frac{1}{6}=\frac{VB}{7.8+r}\therefore\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \left(2\right)
بقسمة (1) .(2)
\ 3=\frac{7.8+r}{2+r}
6+3r=7.8+r 1.8=2r
r=0.9\Omega
بالتعويض فى (1) :
\frac{1}{2}=\frac{VB}{2+0.9}\therefore
\therefore2VB=2.9 VB=1.45V