題圖電路中,已知IS=2A,US=6V,R=6Ω,則電流I為()
A.-2/3A B.-0.5A C.4/3A D.1.5A
題圖電路中電壓U為()
A.-50V B.-10V C.10V D.50V
題圖示電路中I為()
A.2A B.3A C.5A D.8A