WElectrode
WAnode
WClark electrode
WCold cathode
WControl grid
WCopper–copper(II) sulfate electrode
WDropping mercury electrode
WGraphene foam
WHanging mercury drop electrode
WHot cathode
WISFET
WISFET
WISFET
WLightning rod
WMixed metal oxide electrode
WPlate electrode
WQuinhydrone electrode
WReference electrode
WStatic discharger
WTunnel junction
WWehnelt cylinder