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    14.素養(4)
1 如圖所示之電路,試求 V 之值為何?
A 20V
B 35V
C -35V
D -20V

假設下方節點接地,其它節點電壓如下圖

V - 4060 + 3 + V20 = 0

V - 40 + 180 + 3V = 0

4V = -140 ⟹ V = -35V