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已知图中，Us=10V，i1=2A,R1=4.5,R2=1,求i2。（教材P30 1-18（2))
参考答案和解析
× (1)I=6-5=1(A)(2)I1=6+12=18(A)I2=15+I=15+1=16(A)I3=I1-I2=18-16=2(A)故US=Uab+Ubd=3I1+12I3=3×18+12×2=78(V)(3)因为15R-12I3+1×I2=0即15R-24+16=0所以R=(24-16)/15=8/15(Ω)
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