Electronic Components - Diodes
A diode is comprised of two types of semiconductor crystal (usually made from silicon or germanium) that are highly refined then doped with an impurity. Depending on the impurity, the crystal can either be called an “N-type” or “P-type”. When you put an N-doped region next to a P-doped region, a diode or PN junction is formed. In our diodes, the P-region is called the anode, and the N-region is called the cathode. As you can imagine, these properties are useful, allowing current to flow only in one direction. (Follow link: Read and Take Notes)

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