WPhase converter
W866A
WArc converter
WBattery eliminator
WCharge pump
WCockcroft–Walton generator
WCommutator (electric)
WDC injection braking
WHigh-voltage transformer fire barriers
WHVDC converter station
WIsolation transformer
WJoule thief
WMarx generator
WMercury-arc valve
WRectifier
WRotary converter plant
WSpark-gap transmitter
WSwitched-mode power supply
WTraction substation
WTransformer
WVibrator (electronic)
WVienna rectifier
WVoltage multiplier