叠加定理ppt课件教学教程.ppt
3.7叠加定理=回顾:网孔法解的形式:3.7叠加定理对于有唯一解的线性电路,任一该支路电压或电流,是各独立源分别单独作用时在该支路形成的电压或电流的代数和。例:21+-+-10V2IXIX3A 21+-+-10V2IXIX3A21+-2IXIX3A21+-+-10V2IXIXIX=2(A)IX=-0.6(A)IX=IX+IX=1.4(A)=解的形式:3.7齐次定理对于有唯一解的线性电路,各独立源一致增大(或缩小)K倍,则任一该支路电压或电流,也相应地增大(或缩小)K倍。例:21+-+-10V2IXIX3A 21+-+-30V2IXIX9A21+-+-10V2IXIX3AIX=1.43(A)IX=1.4(A)例3。10:+-7V1111111求:各支路电压和电流 +-7VI2I3I1+-7V1111111解一:0.511111 21V1A1V1A2A3V3A5A8V8A13A解二:解二:21V/31A/31V/31A/32A/33V/33A/35A/38V/38A/313A/33.8 互易定理互易定理的证明见P65互易定理应用举例:R3R1I5R2R5R4Us+-求:I5 解:R3R1I5R2R5R4Us+-R3R1I5R2R5R4Us+注意参考方向 R3R1I5R2R5R4Us+-I5R3R5R4R2R1UsII1I3分流:KCL: