1. WINDOWS Part 4 – Components of Computers

2. A World of Computers Computer Literacy –Knowledge and understanding of computers and their uses –Computers are everywhere

3. Computer Applications in Society How are computers used in society?  Education  Finance  Government  Health Care  Science  Publishing  Travel  Manufacturing

4. What Is a Computer? Computer – an electronic device, operating under the control of instructions stored in its own memory, that can: –process the data according to specified rules (processor) –accept data (input) –produce results (output) –store the results (storage) for future use

5. What Does a Computer Do? The four basic operations compromise the Information Processing Cycle

6. Processor Processor – interprets and carries out the basic instructions that operate a computer –Called Central Processing Unit (CPU) –The brains of the computer –Measured in hertz Control Unit – interprets the instructions Arithmetic/Logic Unit – performs the logical and arithmetic processes

7. Units of Speed (characters processed per second) HertzHertz – approximately 1 character KilohertzKilohertz – approximately 1,000 characters MegahertzMegahertz – approximately 1,000,000 characters (1 million) GigahertzGigahertz – approximately 1,000,000,000 characters (1 billion) TerahertzTerahertz – approximately 1,000,000,000,000 characters (1 trillion)

8. Memory Memory – consists of electronic components that store data, instructions, and information, as needed by the processor –Measured in bytes –RAM – Random Access Memory Holds the instructions, programs, information you input Will be lost if not saved (Measured in bytes) –ROM – Read Only Memory Can be read but not modified (system files)

9. Units of Memory ByteByte – approximately 1 character KilobyteKilobyte – approximately 1,000 characters MegabyteMegabyte – approximately 1,000,000 characters (1 million) GigabyteGigabyte – approximately 1,000,000,000 characters (1 billion) TerabyteTerabyte – approximately 1,000,000,000,000 characters (1 trillion)

10. Storage Devices Used to store instructions, data, and information when they are not being used in memory

11. Magnetic Disks Magnetic disks use magnetic particles to store items on a disk’s surface –Floppy disks –Zip disks –Hard disks

12. Optical Discs Optical discs –CD-ROM –CD-R –CD-RW –DVD-ROM –DVD-R –DVD+R –DVD-RW –DVD+RW –DVD+RAM Tape

13. Miniature Mobile Storage Miniature mobile storage media

14. Flash Drives Small, removable storage devices that range from 64 MB to 64 GB Integrated with a USB interface

15. System Unit The processor, memory & storage devices are housed in a box-like case called the system unit

16. Input Devices Any hardware component that allows you to enter data, programs, commands, and user responses into a computer Input Device Examples: –Keyboard –Mouse –Web Cam –Scanner –Camera

17. Output Devices Output devices make the information resulting from processing available for use Output Device Examples –Printers (dpi/ppm) Impact (dot matrix) Photo (inkjet/bubble jet) Nonimpact (laser) –Display Devices CRT LCD

18. Components of a Computer