Transcript 103.04 Presentation File

Give examples of appropriate power supplies
for various scenarios.
Objective 103.04 – 2%
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Connector Types and Voltages
o 20-pin – main power connector to older
motherboards
o 24-pin - main power connector to newer
motherboards; many power supplies use a 20+4
power connector to support both types of boards
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Connector Types and Voltages
o 4/8-pin 12v - provides 12V for
extra CPU power on most
newer motherboards
o PCIe 6/8-pin - auxilliary power
connector for PCIe devices
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Connector Types and Voltages
o SATA – special 15-pin L-shaped
connector capable of
delivering 3.3, 5 and 12 volts
o Molex – the most common
type of power connection for
devices that need 5 or 12 volts
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Connector Types and Voltages
o Floppy – mini connector, also known as Berg,
supplies 5 and 12 volts to 3.5” floppy disk drives
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Specifications
Wattage
o Power rating of a power supply
o Minimum power needed is figured depending on the
total number of devices being powered and their
wattage needs
o 300 watts is the minimum recommended for new
systems
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Specifications
Size (form factors)
o The demand for smaller and quieter PCs has led to
the development of a number of power supply form
factors
o All use standard ATX connectors
o Mini-ATX and Micro-ATX are smaller power supply
form factors
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Specifications
Number of Connectors
o Modern power supplies include a lot of connectors
o Cheaper models come with as few as 10 while more
powerful models come with 25 or more
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Dual Voltage Options
o In the United States, standard AC is between 110
and 120V
o The rest of the world uses 220-240 VAC
o Most power supplies are dual-voltage and
compatible with both options
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Automatic Switching
Power supplies that detect the input voltage and adjust
accordingly to provide the PC with adequate power
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