text/19/5
You will see a big metal box with a
fan on it. That's the power supply.
It takes house current (110 volts,
alternating) and changes it into 5
and 12 volts direct current, to
supply the needs of the computer's
parts. 
~
text/19/68
   You will see the disk drives.
You will also see some large
printed circuit boards that plug
into long sockets on an even bigger
printed circuit board.  The big one
is on the bottom of a standard
desktop case, and on one side of
tower and mini-tower cases. It is
called the motherboard. The boards
that plug into it are called
expansion cards.

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text/364/6
The motherboard contains the
most essential parts of a
computer, the Central
Processing Unit, called CPU,
the RAM and ROM memory, and
an assortment of other
important parts. The
expansion boards contain
special circuits for
"accessories" such as your
monitor, disk drives, and
options you might have such
as a mouse or a modem. 

~
big2C/494/137/
Let's look at the
big2C/486/160/
motherboard
circle/559/165/3
circle/559/170/3