ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Photodiode. This is a type of diode that allows electric current to flow if the light levels are high enough. A diode is an electronic component that acts as a one-way valve for the flow of electric current. Most diodes are semiconductor diodes, made from a combination of semiconductor materials that allow controlled flow of electricity.
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