Diode Current and Reverse Bias

A diode is a nonohmic circuit element that makes current and voltage behave differently from Ohm’s law. In most substances, current is proportional to the voltage applied, but a diode does not show a linear current-voltage relationship.

A diode is a semiconducting device with two terminals: an an...

任何电压与电流之间不呈现线性关系的器件都称为非欧姆器件。例如，二极管是一种半导体元件，不遵循欧姆定律，只允许电流单向通过。

电流与电压的关系图可用于研究二极管的特性。当二极管两端的电压为正且高于0.7伏时，二极管导通。随着外加电压的增加，通过二极管的电流增大，但二极管两端的电压保持在约0.7伏左右。

当二极管的极性反向时，仅有可忽略的电流流过二极管；一旦达到击穿电压，二极管开始导通。