Power Supply:
The power supply converts the alternating current (AC) from your mains (110V input or 220V input) to the direct current (DC) needed by the computer 2.
The power supply is visible from the back of many systems because it contains the power-cord receptacle and the cooling fan.
Speakers
•A hardware device connected to a computer's sound card that outputs sound generated by the computer.
Headphones
•Headphones give sound output from the computer.
•They are similar to speakers; except they are worn on the ears so only one person can hear the output at a time.
Projector
•An output device that can take the display of a computer screen and project a large version of it onto a flat surface
Types of projectors
•Cathode Ray Tube (CRT) projector
•Liquid Crystal Display (LCD) projector
•Digital Light Processing (DLP) projector
Storage Devices
1. USB Flash Drive
At the time of First stage the size of USB Flash Drive was just like 8 MB and now the size of USB Flash Drive is just like 2 GB to 1 TB.
2.Memory Cards is used for storing media and data files. Memory card is is used inside Phone, Camera, etc.
3. CD (Compact Disk)
4. DVD
5. HDD (Hard Disk Drive) contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information.
Other storage devices are:
- card reader/writer
- Compact Flash
- Secure Digital
- SDHC
- micro-SD
- micro SDHC
- XD Picture Card
- Memory Stick
- PRO Duo
- Memory Stick
- Micro (M2)
- USB flash drive
KEYBOARD
Types of Keyboards
- Standard
- Laptop
- Gaming and Multimedia
- Thumb-sized
- Virtual
- Foldable
Pointing Devices
Based on touching a surface
Touchpad
- Graphic tablet
- Touch screen
- Light pen
- Stylus
- Based on moving stick
- Joystick
- Gamepad
Imaging and Video Input Devices
- Digital camera
- Webcam
- Optical scanner
- 3D scanner
- Fingerprint scanner
- Barcode reader
- Audio Input Devices
- Microphone
- MIDI keyboard
Pointing Devices
- Touchpad: A small, touch-sensitive pad used as a pointing device on some portable computers.
- Graphic Tablet: is a computer input device that allows one to hand-draw images and graphics, with a pencil and paper.
- Touchscreen: is an electronic visual display that can detect the presence and location of a touch within the display area.
- Light Pen: is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's CRT display.
- Stylus: is a small pen-shaped instrument that is used to input commands to a computer screen, mobile device or graphics tablet.
- Joystick: an individual to move an object in a game such as navigating a plane in a flight simulator.
- Gamepad: is a peripheral device designed to be connected to a computer or console gaming system.
computer viruses
Viruses are small programs that hide on your disks. use virus detection software the first time that you know that you have a virus is when it activates.
virus spread from one computer to another, either via use of infected floppy disk, or over a computer network, including the Internet.