10 POINTS
HII Write HTML coding for the following
1. Input/output devices
Input Devices
A. Keyboard
B. Mouse
C. Scanner
D. Trackball
Output Devices
Monitor
Printer
Plotter
hurry and tell now
Answers
An input device is something you connect to a computer that sends information into the computer. An output device is something you connect to a computer that has information sent to it.
How does input make an output?
The computer sits between the input and output devices. A computer program processes and digitises the input information. The result is then sent to an output device such as a screen.
Think of a DVD player
You click 'play' on your remote control, an input device. It digitises the input and sends this digital information to the DVD player.
The computer inside the DVD player processes this input information and works out what to do. It will start to read the DVD. The video and audio information from the DVD is then sent to the TV screen and the speakers, the output devices.
Think of a games console
When you are playing a game you are using a controller where you push a button or push the control stick to move a character.
These inputs are digitised and sent to the computer to be processed. The program processes the inputs and gives an output. In this case the character on screen moves as it has been programmed to.
Answer:
What are the output devices?
Output devices can be viewed in the monitor or you can print it on the paper. And that is why printer and monitor are one of the most common output devices.
Printer
The printer is a very important component of a computer. It gives you a printed result of what is displayed on the monitor. The output received from the printer is called hard copy because you can retain it even after you turn off the computer or are no longer working on it. When you look at the printing techniques there are mainly three types of printer:
1. Page printer
2. Character printer
3. Line printer
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Page printer
Page printer can printer a whole page in one go. The examples of page printer are line printer or an inkjet printer. This printer has to store each and every page in memory before printing it. The inkjet printer works by spraying tiny drops of ink on the paper. It can print in colour as well as in black and white format. The quality of printing is good and it does not make any noise. The speed of this printer is measured in pages per minute.
Character printer
Character printer is slow in comparison to the other two printers. It prints around 30 to 600 characters per second. The example of the character printer is a dot-matrix printer. Dot-matrix printer works like a typewriter. It creates an impression on a paper by pressing the ends of the pins that are fixed on its prints heads. The printer offers the low-quality printing and is very noisy.
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Line printer
This is one of the fast printer and prints one line at a time. Generally, it is used when a large amount of output is required. Few of the examples of line printer are drum printer and chain printer. The noise of these printers are also very high and the speed of printing varies from 200 to 2000 line per minute.
Monitor
The monitor is another important component of a computer. It is used to display the processed information. It is known as a visual display unit (VDU). The pictures that are displayed on the screen are shown by using a large number of tiny dots known as pixels. These pixels that are shown on the monitor is referred to as the resolution of the screen.
There are mostly two types of monitors:
1. LCD or liquid crystal display monitor.
2. CRT or Cathode Ray tube monitor.
LCD monitors are lighter in weight can compare to CRT monitors and they are very popular nowadays. The output that is displayed on the screen is known as the soft copy output as it cannot be retained for a longer time.