24. How zener diode is different than ordinary diode
Answers
Diode is the simplest semiconductor device and it consists of two semiconductor layers (one P-type and one N-type) connected to each other. Therefore, diode is a PN junction. Diode has two terminals known as the anode (the P-type layer) and cathode (the N-type layer).
Diode allows current to flow through it, only in one direction that is anode to cathode. This direction of current is marked on its symbol with an arrow head. Since diode restricts the current to only one direction, it can be used as a rectifier. The full bridge rectifier circuit, which is made of four diodes can rectify an alternative current (AC) to a direct current (DC).
Zener diode is made by doing a little adjustment to a normal diode. As mentioned in previous paragraph, a normal diode will conduct a large reverse current and becomes permanently damaged when a large reverse voltage is applied. Zener diode will also conduct a large reverse current, but the device will not be damaged. This is achieved by changing the way of doping the PN junction and this reverse voltage is called the ‘Zener voltage’.
Answer:
A diode is a two-terminal electrical device that conducts current in just one way. A stable reference voltage can be provided via a Zener diode. These diodes are typically used to give a reference voltage in power supply. It has a high resistance at one end and a low resistance at the other.
Explanation:
The simplest semiconductor device is the diode, which is made up of two semiconductor layers (one P-type and one N-type) that are linked to each other. As a result, the diode is a PN junction. An ordinary diode has two terminals known as the anode (the P-type layer) and the cathode (the N-type layer) (the N-type layer).
An ordinary diode permits current to travel only in one direction, from anode to cathode. An arrow head indicates the current's direction on its symbol. Because the diode only allows current to flow in one direction, it can be used as a rectifier. The four-diode full-bridge rectifier circuit may convert alternating current (AC) to direct current (DC) (DC).
A zener diode is created by modifying a standard diode. A typical diode, as described in the preceding paragraph, will conduct a big reverse current and become irreversibly destroyed when a large reverse voltage is applied. A significant reverse current will also be conducted by a Zener diode, but the device will not be harmed. This is achieved by changing the technique of doping the PN junction and this reverse voltage is called the 'Zener voltage'.
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