Computer Operating Systems

Urban Voice -- Instructor: Lenny Bailes

Day 20 Agenda

    1.   Discuss research projects

    2.   Review Quiz 3

    3.    Review Chapter 4 Concepts

     a)  AC vs. DC current (rectifier / transformer )
     AC current has hot | neutral | ground (optional) lines
     short circuits occur when uncontrolled electricity flows from hot to neutral or hot to ground,
                    skipping the devices that provide resistance


                    In DC current, the line connected to the negative terminal is sometimes called the ground
    but there are only two lines

     b)   Common electrical components  (see p.135-136 in the text)
                      conductors, insulators, semiconductors, transistors, capacitors, diodes

        c)     Protecting a computer system
     Electrostatic discharge (ESD) see p.138-139
    Electromagnetic interference (EMI)
     Surge protection, p.139-143
      surge protectors / power conditioners

     d)  Case/motherboard form factors 

          e) Power management

    4.  Team contest on A+ in Depth, chapter 4 questions, p.172-173

    5.  Lab Work: Inspect CMOS settings for Power Management
                              Meyers Multimeter Lab 6.2
    (Meyers p.71-74), and
                               CPU Labs 2.1 - 2.2 (Meyers, p. 14-20)
         (time permitting)

    The following links may be useful for the Meyers CPU labs:

    MCMCSE Study Guide- Processors

    See ( for a near-complete listing of Intel CPUs.
    See Erols com ( and CPU Socket and Slot Criteria for pictures and info about CPUs, sockets, and slots.


    Review/study for A+ in Depth chapter 4 quiz, next week

    Begin reading A+ in Depth Chapter 5 on Motherboards, study the material on CPUs and
    chipsets from page 175-202.  Complete Meyers Labs 2.l - 2.2, if possible, using Internet
    resources to look up information on CPU types, eternal data bus, address bus, and socket form factors.







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