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    14.素養(4)
1 如圖所示電路,電壓Va為何? 113 統測
A -4V
B -2V
C 0V
D 2V

假設最下面節點接地 0V

Vb = 0 - 2 = -2V

Vc = -2 + 1 = -1V

Vd = -1 + 3 = 2V

Ve = 0 + 2 = 2V

Va = 2 - 2 = 0V