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What is LEDs? Short note

LEDs are special diodes that emit light when connected in a circuit. Light emitting diodes (LEDs) are semiconductor p-n junction operating  under proper forward biased conditions and are capable of emitting external spontaneous radiations in the visible range (370nm to 770 nm ) or they nearly ultraviolet and infrared regions of the electromagnetic spectrum.
Circuit Symbol

Advantages of LEDIt has a simple fabrication since there are no mirror facets and in some structure no striped geometry.The simple construction of LED leds to much reduced cost.It is reliable as it does not exhibit catastrophic degradation.It has simple drive circuitry due to generally lower drive currents and reduced temperature dependence. The LED has a linear light output against current characteristics. Disadvantages of LEDLower optical power coupled into a fiber.Usually lower modulation bandwidth.Harmonic distortion.
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What is RAM (Random access memory)?

RAM is a type of data storage used in computers that is generally located on the motherborard. RAM is one of the most important components of not only desktop PCs, but laptops, tablets, smartphones, and gaming consoles. A memory unit is collection of storage cells together with associate circuits needed to transfer information in and out of the memory device. The time it takes to transfer information to or from any desired location is always same hence it is called random access memory abbreviated RAM. Types of Memory Memory is two types of their modes of access of a memory system. 1       Random access memory:-The word of data reading or writing from or to the memory requires same time. We can access the data randomly. 2.Sequential access memory-:- The information stored in some medium is not immediately accessible but is available at certain intervals of time. The time it takes to access a word depends on the position of the word with respect the reading head position: therefore the a…

computer shortcuts keys

Ctrl+Esc Open the STRAT menu Ctrl+Shift+Esc Open windows task Manager Alt+F4 Close the currently active program Alt+Enter Open the properties for the selected item F9 Updates fields(MS Office) F10 Activates menu bar options F11 Toggles between full screen and normal display in browsers F12 Opens save as dialog ( MS office) Ctrl+C Copy selected item Ctrl+V Past selected item Ctrl+X Cut selected item Ctrl+Z

What is use of computer?

computer is a electronics devices. it's play very important role in daily life. with the help of computer you can do varies task and save money.
There are some task given below of computer.

Searching information:  With the help of computer, you can search information with desired topic with help of internet.Office work:  With the help of computer different type of work can do like create document, power point, ms word, creating presentations for meeting and more.Game: With the help of computer, you can play the game like nfs and more.Chatting:  You can use of computer interact of with your friends and family. With the help of computer you can send e-mail and receive e-mail and watch online videos and movies and play online game.Education There are the most important of computer for education purpose. Student find the topic on internet. Security Computer use for security purpose like for camera. In our daily life computer play a very important role. which are use for education, sec…

What is the computer

The computer is an electronic device which is used for the calculating arithmetic and logic. The computer word comes from the Latin word “computer” that means calculate the information as such programmable machine but the computercan not do anything without the programme. In a computer, follow the instruction that called the programme. A set of instruction call programme.


The computer used as a control system in the industrial area, office, personal computer etc. the first computer made by the Charles babbags. Charles babbagsis called ”Grand father” of the computer. The first computer design by Charles babbags was called the Analytical engine. It uses read-only memory from the card.The computer is an advanced electronic device that takes input from the user and gives the output under the instruction that called the programme. It is used for the numerical and non-numerical data(arithmetic and logical) calculations. Full form of computer CCommon Ooriented MMachine PParticularly UUnited and u…

What is the mouse?

Computer mouse, computer peripheral device A computer mouse is a hand-held pointing device that detects two-dimensional motion relative to a surface. This motion is typically translate into the motion of pointer on a display, which allows a smooth control of the graphical user interface. A mouse is a small handheld input device that control a computer screen’s cursor or pointer in conjunction with the way it is move on a flat surface. Some mouse devices have integrated features, such as extra buttons that many be programmed and assigned with different commands. The first public demonstration of a mouse controlling a computer system was in 1968. Originally wired to a computer, many modern mice are cordless, relying on short-rang radio communication with connected system. Mice originally used a ball rolling on a surface to detect motion, but modern mice often have optical sensors that have no moving parts. In addition to moving a cursor, computer mice have one or more buttons to allow o…

What is microprocessors?

A microprocessor is multipurpose, programmable clock driven, register based electronics device that reads binary instruction from a storage device called memory, accepts binary data as input and processes data according to those instructions and provide output. A set of instructions written for the microprocessor to perform a task is called a program and group of programs is called software. Microprocessor is controlling element in a computer system and is sometimes referred to as the CPU(central processing unit) . A microprocessor can control memory and I/O (input/Output) device through a series of connections called buses. Buses select I/O or memory device, transfer data between an I/O device or memory or the microprocessor, and control the I/O and memory system. Microprocessor performs three main tasks for the computer system: 1.Data transfer between itself and the memory or I/O systems. 2.Simple arithmetic and logic operation. 3.Program flow vai simple decisions. Power of the micr…