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Title: CompTIA A+ - Power Supplies
Description: CompTIA A+ certification notes. These notes also work for any general electrical engineering / computer science course.
Description: CompTIA A+ certification notes. These notes also work for any general electrical engineering / computer science course.
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Electricity Basics
Thursday, April 14, 2016
Voltage
8:14 AM
The measurement of the pressure of electricity
...
The measurement of the flow of electricity
...
• Volts x Amperage = Wattage (Power)
...
Alternating Current (AC) Electrical current with an unregulated flow of direction
...
• Alternating Current is better at traveling long distances; unregulated
...
○ Wattage rating determines how many systems they can support
...
• ATX power supplies use soft power
Soft
Power
When power supplies don't have a physical power button but use a jumper cable from the
motherboard
...
P1 Connector
Main connector in power supplies; 20/24 pin connector which connects
to motherboard
...
Mini Power Connector
Used for drive bays (USB extensions)
Molex Power Connector
Used for fans; One of the oldest connectors
Power Wires:
• Yellow Wire: 12 Volts
• Red Wire: 5 Volts
P1 Connector:
Supplementary Power Connector:
Power Supplies Page 2
PCI Express Connectors:
SATA Connector:
Molex Power Connector:
Power Supplies Page 3
Power Supplies Page 4
Niche Power Supplies and Features
Thursday, April 14, 2016
9:02 AM
- ATX power supplies usually only run up to 1200 Watts
Modular Power Supply A type of power supply that allows for plugging / unplugging cables
...
Small Form Factors work exactly the same as larger power supplies
Power Supplies Page 5
Choosing a Power Supply
Thursday, April 14, 2016
6:13 PM
Big factors to power supplies:
- Efficiency: Every power supply has a rated efficiency in percentage
...
- Rails: When power supplies convert AC to DC, there are three different voltages
...
○ 12 V
○ 5V
○ 3
...
A good power system will have 3-4 rails
...
Nothing in a power supply is room temperature
...
Power Supplies Page 6
Power Protection
Monday, April 18, 2016
10:51 AM
Alternating Current in the United States is set to 120 Volts
...
It does this frequency 60 times a second in the United States
...
Spikes destroy equipment
...
When there isn't enough voltage,
electronics will turn off
...
Surge suppressors work by having
capacitators built inside to "smooth out" electrical spikes to 120 volts
...
Good surge suppressors will last a
long time and have an automatic surge reset mechanism
...
To protect from brownouts, you use a Uninterruptable Power Supply (UPS)
...
UPS are measured in Jules
...
Jules
Wattage per second
Power Supplies Page 7
Troubleshooting Power Supplies
Monday, April 18, 2016
11:13 AM
Power supplies are the most susceptible to equipment failure
...
One the ways to measure the health of a power supply is with a voltmeter
...
Power Supplies Page 8
Title: CompTIA A+ - Power Supplies
Description: CompTIA A+ certification notes. These notes also work for any general electrical engineering / computer science course.
Description: CompTIA A+ certification notes. These notes also work for any general electrical engineering / computer science course.