I3=I1+I2-----------------------------------(1)
I3=(E1-I1R1)/R3=(250-I1)/40-------------(2)
E1-I1R1=E2-I2R2
∴E1-E2=14=I1-I2; ------------------------(3)
∵ (1)+(3) I3+14=2I1---------------------(4)
带入禅敬(2) 2I1-14=25/4-I1/40; ∴81I1=250+14*40,
I1=10A; I3=6A; I1=-4A
∴山袭告逗明P1=100W, P2=16W; P3=1440W