HHomeBackground Color:He
LiBeCadmium Main PageBlack White GrayBCNOFNe
NaMgCadmium Pictures PageAlSiPSClAr
KCaCadmium Technical DataScTiVCrMnFeCoNiCuZnGaGeAsSeBrKr
RbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXe
CsBaLaCePrNdPmSmEuGdTbDyHoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRn
FrRaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMcLvTsOg

Cadmium sulfide photoresistor.
An example of the element Cadmium

Sample Image    |    Spin Video    |    QuickTimeVR Rotation
Cadmium Cadmium sulfide photoresistor
Cadmium sulfide photoresistor.
The s-curve on this sensor is made of cadmium sulfide, a semiconductor that becomes significantly more conductive to electricity when it is exposed to light. The sensor is wired in series with a wire coil wrapped around a bi-metallic strip. In the dark, little current flows through the circuit, and the wire coil remains cold. When exposed to light, the resistance drops, current flow increases, and the wire coil heats up the bi-metallic strip, causing it to bend, which in turn snaps a relay contact to the opposite position. This is a daylight sensor designed to turn an outdoor lamp on at dusk and off at dawn.
Source: Farm & Fleet
Contributor: Theodore Gray
Acquired: 22 April, 2009
Text Updated: 23 April, 2009
Price: $10
Size: 0.5"
Purity: <30%
The Elements book Mad Science book Periodic Table Poster  Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here!