1.

A circuit consists of an excitation voltage VS, a resistor network and a resistor R. For different values of R, the values of V and I are as given, R = ∞, V = 5 volt; R = 0, I = 2.5 A; when R = 3 Ω, the value of V is __________

A. 1 V
B. 2 V
C. 3 V
D. 5 V
Answer» D. 5 V


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