运用戴维宁定理求解下图所示电路中的电流I3。图中 US1=12V，US2=15V， R1=3Ω，R2=1.5Ω，R3=9Ω

Question

如题所述

Answer 1

I = (Us2 - Us1) / (R1+R2) = 2/3 A

Uab = Us2 - I * R2 = 15 - 1.5 * 2/3 = 14 V

Rab = 3 * 1.5 / (3+1.5) = 1 Ω

I3 = Uab / (Rab + R3) = 14 / (1 + 9) = 1.4 A

Answer 2

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