Hi guys I will give you some basic knowledge about computer .In this article I will learn you some input device of a computer like keyboard,mouse, ocr, microphone,scanner, because it is very important for you it is always ask in general competion and also give you a general knowledge. I will try to understand you every topic and also I describe this topic in detail which is helpful for you to understand easily.
So let's starts.
First of all know that...
What is input device.
The input unit is responsible for accepting input i.e., data and instructions from the user This work is accomplished with the help of input devices. Device, in general, refers to an equipment or a complete hardware unit. Let us learn more about some most common input devices. lets talk about some common input device which are commonly used in every day.
1. The Keyboard : Keyboard is a typewriter like device which is used to type in the letters, digits and commands. A keyboard contains a matrix of switches (one switch per key). Each key, when pressed, sends a digital code to the computer that determines which key has been pressed.
2.The Mouse : The mouse is a pointing device that points to a position on computer screen. Mouse controls movement of pointer (also called mouse pointer) on screen. When a mouse moves on a flat surface, the cursor on the screen also moves in the direction of mouse's movement. A mouse generally has two or three buttons and it may or may not have a wheel.
(Do you know that mouse was invented by Douglas Agelbart of Stanford Research Centre in 1963 .)
3.Microphone. ( The common name is mic)
We can send sound input to computer through a special input device called microphone or mic in short. A mic converts the sound received into computer's format, which is called digitized sound or digital audio. A mic can work if your computer has a special hardware known as sound card.
4.Scanner
A scanner is a device similar to a photocopier. A scanner creates an electronic form of the printed image, which can later be manipulated, changed and modified according to the requirements. Scanners come in a variety of sizes from hand-held models to desktop models as discussed below .
(i) Hand-held Scanners are very small which can be held in a hand.
(ii) Flatbed Scanners are larger and more expensive scanners but they definitely create higher quality images. These scanners have a flat surface on which the printed image to be scanned, is placed.
(iii) Drum Scanners are medium-size scanners with a rolling drum. The sheet is fed through the scanners so that the drum rolls over the entire sheet to be scanned.
5.Touch Screens
A touch screen can detect where on the screen surface you are touching. Touch screens are often used in mobile devices such as phones and tablets where you would not have space for a traditional keyboard.
6.Barcode Reader
A barcode reader is used to read barcodes which can be found on products in shops. The barcode uses lasers to identify the position and thickness of the bars. Magnetic Stripe Reader A magnetic stripe can be found on the backs of many credit cards, security cards of hotel rooms to gain access to rooms etc. Data is encoded magnetically on the strip and read by a machine as it is swiped.
Some other input devices are.
1. OMR (Optical Mark Reader) that can read marks at designated positions such as the OMR sheets you use to answer questions on a multiple choice exam paper or survey.
2.OCR (Optical Character Reader) that can scan a printed document and convert it into editable text.
3.MI (Magnetic Ink Character Reader) that can read the magnetized ink characters as you can see on bank cheques. Light Pen, a light-sensitive input device shaped like a pen, used to draw on the computer screen or to make menu selections.
If you have any problem to understand in this topic please comment below to ask question.i try to reply you immediately.
But if you like this post you may follow to by submit your email.
Thank you for reading ..........
So let's starts.
First of all know that...
What is input device.
The input unit is responsible for accepting input i.e., data and instructions from the user This work is accomplished with the help of input devices. Device, in general, refers to an equipment or a complete hardware unit. Let us learn more about some most common input devices. lets talk about some common input device which are commonly used in every day.
1. The Keyboard : Keyboard is a typewriter like device which is used to type in the letters, digits and commands. A keyboard contains a matrix of switches (one switch per key). Each key, when pressed, sends a digital code to the computer that determines which key has been pressed.
2.The Mouse : The mouse is a pointing device that points to a position on computer screen. Mouse controls movement of pointer (also called mouse pointer) on screen. When a mouse moves on a flat surface, the cursor on the screen also moves in the direction of mouse's movement. A mouse generally has two or three buttons and it may or may not have a wheel.
(Do you know that mouse was invented by Douglas Agelbart of Stanford Research Centre in 1963 .)
3.Microphone. ( The common name is mic)
We can send sound input to computer through a special input device called microphone or mic in short. A mic converts the sound received into computer's format, which is called digitized sound or digital audio. A mic can work if your computer has a special hardware known as sound card.
4.Scanner
A scanner is a device similar to a photocopier. A scanner creates an electronic form of the printed image, which can later be manipulated, changed and modified according to the requirements. Scanners come in a variety of sizes from hand-held models to desktop models as discussed below .
(i) Hand-held Scanners are very small which can be held in a hand.
(ii) Flatbed Scanners are larger and more expensive scanners but they definitely create higher quality images. These scanners have a flat surface on which the printed image to be scanned, is placed.
(iii) Drum Scanners are medium-size scanners with a rolling drum. The sheet is fed through the scanners so that the drum rolls over the entire sheet to be scanned.
5.Touch Screens
A touch screen can detect where on the screen surface you are touching. Touch screens are often used in mobile devices such as phones and tablets where you would not have space for a traditional keyboard.
6.Barcode Reader
A barcode reader is used to read barcodes which can be found on products in shops. The barcode uses lasers to identify the position and thickness of the bars. Magnetic Stripe Reader A magnetic stripe can be found on the backs of many credit cards, security cards of hotel rooms to gain access to rooms etc. Data is encoded magnetically on the strip and read by a machine as it is swiped.
Some other input devices are.
1. OMR (Optical Mark Reader) that can read marks at designated positions such as the OMR sheets you use to answer questions on a multiple choice exam paper or survey.
2.OCR (Optical Character Reader) that can scan a printed document and convert it into editable text.
3.MI (Magnetic Ink Character Reader) that can read the magnetized ink characters as you can see on bank cheques. Light Pen, a light-sensitive input device shaped like a pen, used to draw on the computer screen or to make menu selections.
If you have any problem to understand in this topic please comment below to ask question.i try to reply you immediately.
But if you like this post you may follow to by submit your email.
Thank you for reading ..........
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