Chapter 2

Question 1

11. What is a computer?

Answer 1

Machine that processes raw data without human intervention using stored instructions (programs) to produce output information
o Computers only process raw facts and cannot change or correct data entered

Question 2

CPU

Answer 2

Central Processing unit
two compontents
1. ALU (arithmetic logic unit)
- Does math and compares units (,+,=,-)

2.CU (control unit)
• Tells the computer where to send output
• Some have more than one processer

Question 3

Hardware components

Answer 3

Physical components
CPU
Internal memory
Secondary type of memory

Question 4

Internal Memory

Answer 4

o Random Access Memory (RAM)

•Stores temporary data and info
       •Volatile memory 
       •	Cache ram
           o	Stores recently used memory, so the processor does not have to wait for the memory to transfer
o	Read Only Memory (ROM)
•	Non volatile
•	Responsible for starting computer

Question 5

Secondary memory

Answer 5

Holds data when computer is off

ex: DVD

Question 6

Software components

Answer 6

system

and application

Question 7

system software

Answer 7

o Are operating systems that manage and control the computer hardware and software
iOS

Question 8

Application software

Answer 8

commercial software sold by developer

ex: word

Question 9

18. Computer servers

Answer 9

Software for managing network resources and offering services
o Many types: print, web, mail

Question 10

How to know what computer is better

Answer 10

Speed
o CPU measure speed highest is Pico second lowest millisecond

Accuracy
o Important as an error could cause space crash

Storage and retrieval
o Saving data in computer memory and accesing
o Data is stored in bits
• 8 bits in one byte