diode is a unidirectional component,it allows passing a
signal in one direction and blocks it in another
direction.when it is forward biased it allows the signal to
pass through it and it blocks that signal if it is reversed
biased.it is used as a switch
it is similar to the water pipe having a volve which allows
water in only one direction. When water is flowing towards
the other direction, the water is blocked by the volve. The
diode is working like this.
dode is an electronic device which is the combination of p
and ntype semiconductors.due to this a potential barrier is
formed and this will not allow current when the diode is
reverse biased due to the extension of potential
barrier.diode allows current in farward biased mod due to
the minimised potential barrier.so it isused to convert a.c
supply to d.c supply.