"In electronics, a diode is a two-terminal electronic component with asymmetric conductance, it has low (ideally zero) resistance to current flow in one direction, and high (ideally infinite) resistance in the other. A semiconductor diode, the most common type today, is a crystalline piece of semiconductor material with a p–n junctionconnected to two electrical terminals. A vacuum tube diode is a vacuum tube with two electrodes, a plate(anode) and a heated cathode. " Wikipedia
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