ElectroMech Lab

Diode is an electronic component, which allows current to flow in one direction It has two Terminals; Anode & Cathode. It is used in two modes; Forward bias and Reverse bias. 1.         Forward bias: When +ve Voltage is connected to Anode and –ve to Cathode. 2.        Reverse bias: When -ve Voltage is connected to Anode and +ve to Cathode. Zener Diode & Photo Diode are used in reverse bias mode. In Forward bias, it shows least resistance and in Reverse bias it shows higher resistance. Some diodes are used in forward bias and some are used in Reverse bias. There are many types of Diodes, and according to the requirement, they are used.   Type of Diode 1.         Normal Rectifier Diode 2.        Light Emitting Diode (LED) 3.        Zener Diode 4.        Schottky Diode 5.        Photo Diode 6.        Transient Voltage Suppression Diode (TVS)     Rectifier/Power Diode This is also known as Power Diode This is used for rectification in pow

Relay is an electrically operated switch that opens and closes the circuit by receiving electrical signal from the outside source  Relay Type: Ø   Relay technology is divided into two categories 1. Movable Contacts 2. No-Movable Contacts   Mechanical Relay                    Solid State Relay                         Relay Types: Mechanical Relay Ø   This relay has contacts that are mechanically actuated to open/close by a magnetic force Ø   This magnetic force is produced by a coil which is excited by the electric current Ø   Due to movable part it creates noise during operation   Solid-State Relay Ø   This relay does not have mechanical contacts to control outputs Ø   There are electrical switching elements such as Triac and MOSFET Ø   Since no movable part is there so no noise it creates   Mechanical Relay- Advantages Ø   It provides physical isolation between input and output Ø   It can withstand higher voltages Ø   These relays can