Download Unit 1.3 Power Supplies

CompTIA A+ Certification
801 Support Skills
Unit 1.3 Power Supplies
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Objectives
• Identify the parts and
connectors of a PC
Power Supply Unit
(PSU)
• Select and install a PSU
appropriate to a given
PC system
Unit 1.3 Power Supplies
Slide 2
Electrical Circuits
•
Voltage
– Potential difference
– Volts
•
Current
– Flow of electrons
– Amps
•
Resistance
– Conductivity
– Ohms (R)
•
Power
– Watts
– Volts * Amps
•
AC versus DC
Unit 1.3 Power Supplies
Slide 3
Electrical Components
• Conductor
• Insulator
• Semiconductor
• Resistor
• Diode
• Fuse
• Transistor
• Capacitor
Unit 1.3 Power Supplies
Slide 4
Power Supply Unit (PSU)
• AC – DC (3.3V, 5V, 12V)
power conversion
• Dual voltage (110 vs 240
VAC) options
• Maximum power output /
wattage / sizing
• Form factors
– ATX
– SFX12V (smaller all round)
– TFX12V (long and narrow)
Unit 1.3 Power Supplies
Slide 5
Connector Types and Voltages
•
•
•
•
ATX
–
20-pin P1 (±12V, +5V, and
+3.3V)
–
4-pin Molex (+12V and +5V)
–
4-pin mini-Molex (or Berg)
–
6-pin AUX (+5V and +3.3V)
ATX12V v1.x
–
4-pin +12V
–
SATA (optional)
ATX12V v2.x
–
24-pin P1
–
SATA (+12V, +5V, and +3.3V )
–
6- and 8-pin PCIe (+12V)
EPS12V
–
PSU Type
CPU
P4 / Athlon
Legacy (preP4 / Athlon)
ATX
Good
Incompatible
ATX12V v1 OK
Good
ATX12V v2 Poor /
Good
Incompatible
Core / Athlon
64 and Later
Incompatible
Incompatible
Good
8-pin +12V
Unit 1.3 Power Supplies
Slide 6
Installing a PSU
•
Remove connectors
•
Unscrew from case
•
Install new PSU – set AC input type if
manually switched
•
Make power and fan connections to
motherboard and storage drives
Unit 1.3 Power Supplies
Slide 7
Review
• Identify the parts and
connectors of a PC
Power Supply Unit
(PSU)
• Select and install a PSU
appropriate to a given
PC system
Unit 1.3 Power Supplies
Slide 8
Labs
• Lab 2 Identifying PC
Components
Unit 1.3 Power Supplies
Slide 9