Diodes are the main component of the rectifiers.It is mostly used in electronics devices in power electronics and other.The rectifiers diodes has smaller voltage drop in froward-bias state as compared to the operating voltages. The very small leakage current flow in the reverse-bias state.The froward bias characteristics of the power diode is normally linear, which means that the voltage drop is proportional ohmic resistance and current .The rated currents of power diodes approach kilo-amperes.
At ON: the diode can be considered as an ideal switch ,because it open suddenly .In the most of the circuit the leakage current does not have significant effect on the circuit .So diodes can be considered as switch.
At OFF: only small leakage current flows through the diode.This current is independent of the reverse voltage until the breakdown voltage is reached.
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