WElectrical breakdown
WArc flash
WAvalanche breakdown
WBreakdown voltage
WBrush discharge
WCorona discharge
WCorona ring
WElectric discharge
WElectric spark
WElectrical disruptions caused by squirrels
WElectrical treeing
WElectrostatic discharge
WGeiger–Müller tube
WInduction coil
WIonized-air glow
WKirlian photography
WLichtenberg figure
WLightning
WPaschen's law
WSpark gap
WTesla coil
WJohn Sealy Townsend
WVoltage-regulator tube
WZener effect