如圖所示,試求流經(jīng)A、B兩點(diǎn)間的電流i為()安培
A.3 B.4 C.5 D.6
如圖所示,求E2在R2上所產(chǎn)生之壓降為何()
A.-4V B.10V C.-3V D.12V
如圖所示,試求6Ω的端電壓為()伏特
A.12 B.9 C.5 D.7