What is a computer (Slides)

Question 1

Functions of a computer

Answer 1

• Gathers Data
• Processes information
• Outputs Data or Info
• Stores Data and Info

Question 2

Data VS. Information

Answer 2

Data: Representation of a fact, figure or idea
Information: Organized, meaningful data.

Question 3

Bits and Bytes

Answer 3

• Bit : Binary Digit, 0 or 1, Every instruction is converted to bits
• Byte: 8 Bits, each character is a string of eight 0s and 1s.

Question 4

Input Devices

Answer 4

translate words, numbers, sounds, images, in a form that system unit can understand.
- keyboard
-Mouse
-Microphone
-Scanner
-Stylus
-Touch Screen

Question 5

Mice : types

Answer 5

-Optical Mouse
-Wireless
-Trackball
-Integrated pointing device

Question 6

Output Devices

Answer 6

-Monitors
-Printers
-Headphones
-GPS
-Projector
-Speakers

Question 7

Monitor types

Answer 7

Cathode Ray Tube : more space, energy. Better Viewing.
Liquid Crystal Display: less space, energy efficient, contrast ratio, response time
Digital Interactive Whiteboards
Digital Projectors

Question 8

Printers

Answer 8

• Impact Printers : Dot-Matrix
  -3D Printers
  -Nonimpact Printers: Inkjet and Laser
  -Specialty Printers: All in one and Thermal

Question 9

Inkjet VS. Laser

Answer 9

Inkjet: less expensive, high quality colors
Laser: expensive, faster, color laser is less expencive.

Question 10

Choosing a printer

Answer 10

speed, resolution, color output, use and cost

Question 11

RAM VS. ROM

Answer 11

RAM : Temporary volatile Storage, several memory cards.
ROM : stores start-up instructions, permanent storage.

Question 12

CPU

Answer 12

-The brain of the computer
- Controls all functions of a computer
- Processes all commands and instructions

Question 13

CPU Performance Measures

Answer 13

Speed, Cores, Front Side Bus, Cache Memory

Question 14

Hard Drive

Answer 14

• Permanent
• Internal or external

Question 15

Optical Storage

Answer 15

• CDs , DVDs, Blue Ray Discs
• Formats : Read Only, Write Once, Rewritable

Question 16

Flash Memory (Types of SSD)

Answer 16

• Newer storage, plugs into USB ports or into slots

Question 17

SSD

Answer 17

-Fast, durable and expensive and lower capacity

Question 18

Ports

Answer 18

• Expansion cards and hubs
• ## USB, serial and paralle, audio and video, connectivity (Ethernet)

Question 19

Hard disks

Answer 19

metallic platters, lage capacity

Question 20

Hard Disks Performance enhancement

Answer 20

Disk Caching: temporary high speed area between SSD and CPU
Hybrid Drives : both SSd and HDD, low cost, large capacity.
File Compression and Decompression : before storing and after.
Redundant Array of Inexpensive Disks : more performance

Question 21

Cloud Storage

Answer 21

-Provides storage, processing and memory
- less maintenance, fewer hardware upgrades
- slower access speed, less control over file security