LEDs produce light of many colours in a very wide range of equipment from simple indicator lamps to huge and complex video displays. Photo diodes also produce electrical current from light.
When the polarity of the battery is such that electrons are allowed to flow through the diode, the diode is said to be forward-biased. Conversely, when the battery is “backward” and the diode blocks current, the diode is said to be reverse-biased. A diode may be thought of as like a switch: “closed” when forward-biased and “open” when reverse-biased.
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