lesson 6 power and power supplies Flashcards
converts high voltage ac current to low voltage dc current
Power Supply
Cycles back and forth rather than traveling in only one direction
▪ Most economical way to transmit electricity
AC current
type of current used by mobo , fans and pcie graphics cards
DC current- ( dc current travels in only one direction)
common dc voltages and wire colours
3.3V orange, 5V red , 12V yellow and ground black
what to consider when purchasing a power supply
- Type of Power supply and compatibility
- Wattage and capacity requirements
- Amount and type of connectors
what is power supply rated in
watts
at -advanced technology legacy power supply
20 pin power connector
ATX12v advanced technology extended
20+4 pin power connector
how much power should your power supply have if you plan on future upgrades
It is common practice to add 30% more
wattage on a power supply to plan for
future upgrades
ATX 12V version 2
24 pin connector backaward compatible with atx
powers Case fans, IDE hard drives,
and optical drives
Molex power connector (4-PIN)
Powers Floppy Drives
miniBerg power connector 4 pin
Serial ATA hard drives and
optical drives
15 pin power connector
Video cards POWER CONNECTOR
PCIE 6 PIN AND 8 PIN
single rail architecture
A rail is the printed circuit board (PCB) inside the power supply to which the external cables are connected. A single rail has all of the connectors connected to the same PCB
multi rail architecture
a multi rail PCB has separate PCBs for each connector
instance, in dual-rail power supplies, one rail might be dedicated
to the CPU, while the other is used to supply power to all of the other
components that need 12V.
increase in
voltage from 115VAC to
120VAC or higher
surge(use surge protector for protection)
quick increase in
voltage and then back to
normal
spike( use surge protector for protection)
decrease in voltage to
110VAC, if less than a
second known as a sag
brown-out (use ups for protection)
total loss in
power
blackout (use ups for protection)
power supply fan failure
Replace Could mean other components are on their way out
Fuse Failure:
Cause - Overload or due to power supply malfunctioning
Replace - Do not attempt to replace fuse.
power supply troubleshooting
never replace a power supply
Plugs directly into the power
supply to test for problems
power supply tester
commonly use them to measure
power supply voltages.
multi-meter
Takes out dust efficiently but
can cause ESD if not used correctly.
computer vaccum
used to spray
out dust but should never be used upside down but
at an angle and never directly on case fan blades
Compressed Air and Compressors
