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A computer is anelectronic machine thatcan accept data,
perform certainoperations to solve
problems, and presentresults in anunderstandable format.
omputers
Everywhere
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A computer contains manyelectronic and mechanical
components known a hardware. Thesecomponents include input devices,output devices, system units,storage devices, andcommunicationdevices.
ComputerHardware
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An input devices allows you to enterdata or instructions into the computer.The keyboard, mouse, microphone,scanner digital camera, and PC videocamera are all input devices.
InputDevices
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A keyboard contains keys you press toenter data into the computer.
A keyboard is a set of buttons that sendcoded signals to a computer, printer, orcommunications channel. Each button, orkey, corresponds to one or more letters,numbers, symbols, or special commands.
Keyboar
d
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Computer Mouse (Mice) is a smallhandheld device. With a mouse youcontrol the movement of a small symbolon the screen called the pointer and you
make selections.
computer uses a mouse or other pointing
device to follow the movement of yourhand, and convert that motion into
Mous
e
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Amicrophone allows you to speakto the computer to enter data andinstructions.
Microphon
e
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A scanner converts printed materials,such as documents and pictures, into a
form the computer can use. For example,you can scan a picture and place it in aword document.
Scanne
r
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A digital camera, you can take
pictures and then transfer them tothe computer or print them. There isno need to store the images ontraditional film.
DigitalCamera
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APC video camera is a digital videocamera that allows you to create a movieor take still photographs
electronically. With a PC web camera,which you attach to your computer, youcan see your friend as you communicate
with each other on the internet.
PC Video
Camera
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An output device is any hardware thatconveys information to one or morepeople. Three commonly used output aretheprinter,monitor, andspeakers.
Output
Devices
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A printer produces texts and graphics onpaper.
er
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A monitor displays texts, graphics, andvideos on its screen.
Monit
orLCD (Liquid Crystal Display)
LCD / Flat-panel monitors is a digitaldevice that use backlit liquid crystal
technology to produce images on atransparent plastic screen.
CRT (Cathode Ray Tubes)
CRT monitors are analog devices that use acontinuous stream of electrons to create animage on the screen. That means that yourgraphics card must convert the computer'sdigital signal into a signal that the CRTmonitor can understand.
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Aspeakers allow you to hear music,and other sounds.
Speake
rs
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A computer keepsdata,
instructions,and informationon storage
media.
Types of storagemedia:
Diskettes
USB flash
drives
Storage
Media
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A communication device is a hardware
component that enables a computer tosend a receive data, instructions, andinstructions and information to andfrom one or more computers. A widelyused communication device is themodem.
Communication
Devices