Many personal computers plug in standard wall
outlets, which supply an alternating current
(AC) of 115 to 120 volts. This type of power
is unsuitable for use with a computer, which
requires a direct current (DC) ranging from 5
to more than 15 volts. The power supply is the
component of the system unit that converts the
wall outlet AC power into DC power. Different
motherboards and computers require different
wattages on the power supply. Notebook computers,
including netbooks and Tablet PCs, can
run using either batteries or a power supply. If
a power supply is not providing the necessary
power, the computer will not function properly.
Built into the power supply is a fan that keeps
the power supply cool. Some have variable
speed fans that change speed or stop running,
depending on temperature in the system unit.
Many newer com puters have additional fans
near certain components in the system unit such
as the processor, hard disk, and ports. Some
users install more fans to help dissipate heat
generated by the components of the system
unit. Mobile users may place their notebook
computer on a cooling pad to help disperse the
computer’s heat.
Some external peripherals such as a cable
modem, speakers, or a printer have an AC
adapter, which is an external power supply. One
end of the AC adapter plugs in the wall outlet
and the other end attaches to the peripheral.
The AC adapter converts the AC power into
DC power that the peripheral requires.
Putting It All Together
Many components of the system unit influence
the speed and power of a computer, including
the type of processor and the amount of RAM.
The table in Figure 4-38 lists the suggested minimum
processor and RAM requirements based on
the needs of various types of computer users.
How many fans are in a system unit?
Most system units have at least three fans:
one in the power supply, one in the case, and
one on the processor heat sink. In addition,
you also may find a fan on a video card or
other adapter card. While some computers
contain fans that are designed to be quiet or
operate in a quiet mode, others allow you to
turn off noisy fans until they are needed. You
also can purchase utility programs that slow
or stop the fan until the temperature reaches
a certain level.
For more information, visit scsite.com/dc2011/
ch4/faq and then click Computer Fans.
FAQ 4-
Many personal computers plug in standard wall
outlets, which supply an alternating current
(AC) of 115 to 120 volts. This type of power
is unsuitable for use with a computer, which
requires a direct current (DC) ranging from 5
to more than 15 volts. The power supply is the
component of the system unit that converts the
wall outlet AC power into DC power. Different
motherboards and computers require different
wattages on the power supply. Notebook computers,
including netbooks and Tablet PCs, can
run using either batteries or a power supply. If
a power supply is not providing the necessary
power, the computer will not function properly.
Built into the power supply is a fan that keeps
the power supply cool. Some have variable
speed fans that change speed or stop running,
depending on temperature in the system unit.
Many newer com puters have additional fans
near certain components in the system unit such
as the processor, hard disk, and ports. Some
users install more fans to help dissipate heat
generated by the components of the system
unit. Mobile users may place their notebook
computer on a cooling pad to help disperse the
computer’s heat.
Some external peripherals such as a cable
modem, speakers, or a printer have an AC
adapter, which is an external power supply. One
end of the AC adapter plugs in the wall outlet
and the other end attaches to the peripheral.
The AC adapter converts the AC power into
DC power that the peripheral requires.
Putting It All Together
Many components of the system unit influence
the speed and power of a computer, including
the type of processor and the amount of RAM.
The table in Figure 4-38 lists the suggested minimum
processor and RAM requirements based on
the needs of various types of computer users.
How many fans are in a system unit?
Most system units have at least three fans:
one in the power supply, one in the case, and
one on the processor heat sink. In addition,
you also may find a fan on a video card or
other adapter card. While some computers
contain fans that are designed to be quiet or
operate in a quiet mode, others allow you to
turn off noisy fans until they are needed. You
also can purchase utility programs that slow
or stop the fan until the temperature reaches
a certain level.
For more information, visit scsite.com/dc2011/
ch4/faq and then click Computer Fans.
FAQ 4-
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