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    14.素養(4)
1 如圖所示電路,電流Ia與Ib分別為何? 112 統測
A Ia=1A、Ib=2A
B Ia=2A、Ib=1A
C Ia=0A、Ib=2A
D Ia=1A、Ib=0A

用重疊定律,先看1A,其它電壓源短路,電流源斷路

Ia = 1 × 42+4 = 23 A

Ib = 1 × 22+4 = 13 A


再看2A,其它電壓源短路,電流源斷路

Ia = 2 × 33+3 = 1A

Ib = 2 × 33+3 = 1A


再看4V,其它電流源斷路

Ia = - 41+2+3 = - 23A

Ib = 41+2+3 = 23A


Ia = 23 + 1 - 23 = 1A

Ib = 13 + 1 + 23 = 2A