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Light Emitting Diode







Assignment

LED-Lamps have a very high efficiency as far as the conversion of electric energy into light is concerned. Apart from that, they can react extremely quickly to on/off switching. If constant on and off switching is required, the service life of the electric light bulb decreases, and the service life of light-emitting diode increases. In addition, it can be produced very economically and is light-weight. A disadvantage is, that it looses roughly half of its brightness at the end.

Function

This type of lamp (LED) or Light Emitting Diode. It is a diode which generates, in the current-flow direction, light whose colour is determined by the semi-conductor material used. Apart from the colours red, yellow and green, blue coloured LEDs are now also relatively inexpensive.

The two connections of the LED are, in the original state, different lengths. Whereby, the longer must be connected with the anode (+) and the shorter with the cathode (-). However, incorrect connection is not punished with a defect, the diode is simply disabled and does not light up. 07/10




ColourVoltage
red1,8 - 2 Volt
orange2,2 - 3 Volt
yellow2,4 - 3,2 Volt
green2,7 - 3,2 Volt


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