半波倍壓器如圖所示,變壓器之次級圈標(biāo)示12V(rms),則C2之耐壓至少須為()
A.17V B.40V C.12V D.24V E.6V
如右圖所示倍壓器電路,若D1、D2為理想二極管,則輸出電壓Vo為()
A.141V B.-141V C.200V D.-200V
A.2 B.3 C.√2 D.1