Input & output Devices.
An I/O device is any hardware that allows a human operator or other systems to interface with a computer. Input & output devices, as the name implies, are capable of producing data (output) to and receiving data from a computer system (input).
It receives data as input and provides it to a computer, as well as sends computer data to storage media as a storage output.
Input Devices
Keyboard
The keyboard is the most frequent and widely used input device for entering data into a computer. Although there are some additional keys for performing other operations, the keyboard layout is similar to that of a typical typewriter. Generally, keyboards come in two sizes: 84 keys or 101/102 keys, but currently keyboards with 104 keys or 108 keys are also available for Windows and the Internet.Types of Keys
Numeric Keys:
It is used to enter numeric data or move the cursor. It usually consists of a set of 17 keys.
Typing Keys:
The letter keys (A-Z) and number keys (09) are among these keys.
Control Keys:
These keys control the pointer and the screen. There are four directional arrow keys on it. Home, End, Insert, Alternate(Alt), Delete, Control(Ctrl), etc., and Escape are all control keys (Esc).
Special Keys:
Enter, Shift, Caps Lock, NumLk, Tab, etc., and Print Screen are among the special function keys on the keyboard.
MOUSE
A mouse is an input device that lets you move the mouse on a flat surface to control the coordinates and movement of the on-screen cursor/pointer.
The left mouse button can be used to select or move items, while the right mouse button when clicked displays extra menus.
Joystick
Light Pen
Scanner
OCR
Bar Code Reader
A bar code reader scans a bar code image, converts it to an alphanumeric value, and then sends it to the computer to which it is connected.
Web Camera
A webcam is a computer-connected tiny digital video camera. It’s also known as a web camera because it can take images and record video. These cameras come with software that must be installed on the computer in order to broadcast video in real-time over the Internet. It can shoot images and HD videos, however, the video quality isn’t as good as other cameras (In Mobiles or other devices or normal cameras).
Monitor
The two kinds of viewing screen used for monitors are:
(2) Flat-Panel Display Cathode-Ray Tube Monitor: In comparison to the CRT, a flat-panel display is a type of video display with less volume, weight, and power consumption. They can be hung on the wall or worn on the wrist.
Flat-panel displays are currently used in calculators, video games, monitors, laptop computers, and graphical displays.
Printer.
There are two types of printers:
(a) Impact Printer:
Characters are printed on the ribbon, which is subsequently crushed against the paper, in impact printers.
The following are the characteristics of impact printers:
Exceptionally low consumable cost.
Quite noisy
Because of its low cost, it is ideal for large-scale printing.
To create an image, there is physical contact with the paper.
(b) Non-Impact Printers:
Characters are printed without the need for a ribbon in non-impact printers. Because these printers print a full page at a time, they’re also known as Page Printers. The following are the characteristics of non-impact printers:
Faster
They don’t make a lot of noise.
Excellent quality
Supports a variety of typefaces and character sizes
Question 1.
List Disadvantages of CRT Monitor.
Answer:
Some of the disadvantages of CRT are :
High power consumption
Big back and take up a lot of desk space.
Because it is less bright than an LCD, it is not ideal for excessively bright environments.
They’re big, heavy, and clumsy.
Question 2.
Compare input & Output Devices.
Answer.
S.No Input Device Output Device
1.
Data is accepted from the user of the device
It shows the data after processing to the user
2.
It accepts the user’s data and transmits it to the processor for saving in the secondary memory or processing.
It receives the data from the processor and returns it to the user.
3.
More complex designing
Less complex designing
4.
These devices are used to accept the data
These devices are used to display or show the data
5.
Example: Keyboard, mouse, etc.
Example: Monitor, Printer, etc.
Question 3.
What are the types of flat-panel displays?
Answer:
There are 2 types of flat-panel displays :
(a) Emissive Display: Devices that turn electrical energy into light are known as emissive displays. Example: LEDs, Plasma panels, thin film electroluminescent displays etc.
(b) Non- Emissive Display: Optical effects are used in Non-Emissive displays to turn sunshine or light from another source into graphical patterns. LCDs are a good example (Liquid Crystal Device).
Question 4.
Explain the output device: Plotter.
Answer:
A plotter is a device that prints graphics in a variety of color formats with high-quality images. It’s similar to a printer, but with more advanced capabilities.
Plotter allows us to create pictures, 3D postcards, advertising signs, charts, and various designs of the internal structure of building machines, as well as print large maps, architectural drawings, large-format printing, and create pictures, 3D postcards, advertising signs, charts, and various designs of the internal structure of building machines.
Compare Impact & Non-Impact Printers.
Answer:
S.No Impact Printers Non-Impact Printers
1.
Slow Speed
Fast Speed
2.
Makes a lot of Noisy
They are less Noisy
3.
Cheap
Costly
4.
Poor quality as compared to non-impact printers.
Good quality printing
5.
It works by hammering a set of metal pins or a character set into the paper.
Ink is deposited in several forms during printing.