National Bird Day is celebrated every year on 5 January . This day is observed to spread awareness about birds, their importance in nature, and the need to protect them. Birds are beautiful living beings and play a very important role in keeping our environment healthy. Origin of National Bird Day National Bird Day was first celebrated in the year 2002 . It was started by bird lovers and environmental groups to protect birds from dangers like deforestation, pollution, and illegal hunting. The main aim of this day is to teach people, especially students, why birds are important and how we can help save them. Why Is National Bird Day Celebrated Every Year? National Bird Day is celebrated every year because many bird species are disappearing due to human activities. Cutting trees, using plastic, pollution, and climate change are harming birds and their homes. This day reminds us that: Birds need protection Nature should be respected Everyone has a responsibil...
Power Devices Introduction of power device Power semiconductor diodes are similar to low power pn-junction diodes. Power transistors are identical with npn or pnp signal transistors. Power diodes are constructed with n - layer, this n - layer is called drift region , which exists between p + layer and n + layer. The p + and the n + layers are known as anode, and cathode (substrate) respectively. The n - layer is used to support a large blocking voltage. This n - layer is not present in low power diodes or signal diodes. Note: The low power diodes and transistors are also known as signal diodes and signal transistors respectively. Difference between Power semiconductor and Signal semiconductor Power semiconductor diode and transistor Signal semiconductor diode and transistor The voltage, current and power ratings of these devices are high. The voltage, current and power ratings are these devices are ...