A diode is a semiconductor device used for passing electrical energy in a single direction. It means that when connected in an electrical circuit, the diode will allow the current to flow in one specific direction only and not in the reverse direction. If, reverse flow is required the terminals of the diode will have to be interchanged.
Diodes are in widespread use in the electronic industry. For a comparison, a diode can be compared to valve used to control liquid flow. Diodes are connected in different formations known as bridges depending on the purpose for which the electronic device is to be used. Different types of diodes are available operating at various levels of power and frequency.
