Text pages 88 - 119

1
Ch. 4 The Electronic Computer Age

• Chapter 4
• Text pages 88 - 119

2
Electric Current Flow
The flow of electrical current through a wire is
similar in concept to the flow of water though a
pipe

• A greater force will make a larger current flow
• If a larger wire is used, there is less
  resistance more current will flow
• The equation that describes current flow in an
  electrical circuit is called Ohms Law
• If voltage (force) gets larger, current gets
  larger
• If Resistance gets larger, current gets smaller
• Current (amps) Voltage (volts) / Resistance
  (ohms)
• I V/R

3
Computer Systems

• PROCESSOR Heart of the computer
• MEMORY - Place the program is stored
• INPUT - Information given to a computer
• OUTPUT - Screen display or hard copy

4
Computer Input Devices

• Keyboard Tapes
• Light/Touch Sensitive Screens
• Hard Floppy Discs
• Optical Character Reader
• Speech Recognition
• Mouse Light Pens

5
Computer Output Devices

• Video Monitor
• (Cathode Ray Tube Screen)
• Printers -- Hard Copy
• (Dot Matrix, Laser, Ink Jet)
• Audio Output
• (Tones, beeps, music, voice)

6
Types of Computers

• Micro-Computers
• (cars, appliances computers)
• Minicomputers
• (used by small companies individuals)
• Main-Frame
• (used by universities, large companies and
  agencies)
• Supercomputers
• (used for research)

7
Software

• Operating System
• (Allows user to control access memory, printer
  peripheral devices MSDOS, Windows)
• Applications Program
• (Tells computer to carry out specific tasks
  Games, Word Processing, Car Engine Control
  Programs)
• Programming Languages
• (Pascal, Basic)

8
Ch 4 Assignments

• Group 2
• Use these notes and Living with Technology text
  book to complete the Chapter 4 Work Sheet, Qs
  Terms.
• Do Qs 3 7 on page 115.
• Define the following Terms
• Complete Ch4 Worksheets (T/F, Multiple-Choice,
  Fill-in-Blank)
• Group 1
• Complete DC Circuit Quest (See assignment page)
• Pass in