A diode is a two-terminal electronic device that permits the flow of current primarily in one direction.

Overview

A diode is a two-terminal electronic device that allows current to flow in just one direction. When flowing in the forward direction, the diode acts as a wire with very low resistance, creating a short-like condition. Attempting flow in the reverse-biased direction will result in a very high resistance, prohibiting the flow of current, creating an open circuit condition.

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