A ____ is a two-terminal electronic ____ that conducts current primarily in ____ direction (asymmetric conductance); it has ____ (ideally zero) resistance in one direction, and ____ (ideally infinite) resistance in the other. A diode ____ tube or thermionic diode is a vacuum tube with two ____, a heated cathode and a plate, in which electrons can flow in only one direction, from cathode to plate. A semiconductor diode, the most ____ used type today, is a crystalline piece of semiconductor material with a p–n ____ connected to two electrical terminals. Semiconductor diodes were the ____ semiconductor electronic devices. The ____ of asymmetric electrical conduction across the contact between a crystalline mineral and a metal was made by German physicist Ferdinand Braun in 1874. Today, most diodes are made of ____, but other semiconducting materials such as gallium arsenide and germanium are also used.

Diodes

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