Devices

Devices

1. Output

   • Monitor
     • a monitor works carries radio waves, invisible patterns of electricity and magnetism that race through the air at the speed of light (300,000 km or 186,000 miles per second). Think of the radio waves carrying information like the waves on the sea carrying surfers: the waves themselves aren't the information: the information surfs on top of the waves.
   • Printer
     • A printer works by bouncing lasers of a metal drum which creates static electricity which will be attracted to a inked page of inked paper called toner.
   • Projecter
     • A projector works by a very bright light that shines through a small LCD screen into a lens, which throws a hugely magnified image of the screen onto the wall. The technology is sometimes called LCLV (liquid crystal light valve).
   • Touch screen
     • Unlike resistive touch screens, capacitive screens do not use the pressure of your finger to create a change in the flow of electricity. Instead, they work with anything that holds an electrical charge – including human skin.
   • controller
   • TV
     • a tv works carries radio waves, invisible patterns of electricity and magnetism that race through the air at the speed of light (300,000 km or 186,000 miles per second). Think of the radio waves carrying information like the waves on the sea carrying surfers: the waves themselves aren't the information: the information surfs on top of the waves.
   • phone
     • imagine calling a friend on the other side of town. As you chat away, your phone converts your voice into an electrical signal, which is then transmitted as radio waves and converted back into sound by your friend’s phone. A basic mobile phone is therefore little more than a combined radio transmitter and a radio receiver, quite similar to a walkie-talkie or CB radio.
   • plotter
     • It takes instructions from a computer and uses a pen or laser to draw it

2. Input

   • Keyboard
   • electric pen and pad
   • webcam
   • Controller
   • mouse
   • touch screen
     • Unlike resistive touch screens, capacitive screens do not use the pressure of your finger to create a change in the flow of electricity. Instead, they work with anything that holds an electrical charge – including human skin.

3. Storage

   • hard drive
     • A hard drive works by taking all of the data and putting it into binary code
   • USB
     • is a portable hard drive to store data in binary code
   • CD
   • SD card
   • floppy disc
     • A floppy disk is a lot like a cassette tape: Both use a thin plastic base material coated with iron oxide. This oxide is a ferromagnetic material, meaning that if you expose it to a magnetic field it is permanently magnetized by the field. Both can record information instantly.

4. Processing

   • graphic card
   • Video
   • mobile phones
   • Hard Disk
   • Dual Core

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