Power Supplies

Question 1

PC Power

Answer 1

AC to DC power

Question 2

Power Supply connector

Answer 2

IEC-320 is the wall plug

Question 3

Modern Voltage

Answer 3

Dual Voltage with a switch

Question 4

IEC-320 Plug

Answer 4

3 holes - hot, neutral, ground

Hot wire carries voltage, pipe
Neutral carries no voltage, drain
Ground allows excess to safely ground

Question 5

Testing AC Power

Answer 5

Use multimeter

Hot outputs 115v
Neutral 0v
Ground 0v

Question 6

AC Adapters

Answer 6

Not interchangable

Check Voltage, Amperage, and Polarity

Question 7

Multimeter Tests

Answer 7

Continuity
Resistance
AC Voltage (VAC)
DC Voltage (VDC)

Question 8

Continuity

Answer 8

Can electrons flow from one end of wire to other

Question 9

Resistance

Answer 9

Use if do not have continuity setting

Question 10

Sag and Surge

Answer 10

Power fluctuations from power company

Can be brownout or blackout

Question 11

Surge Suppressor

Answer 11

absorbs extra voltage

check joules rating, min 2000

UL LCC 1449 rating

Question 12

UPS

Answer 12

Uninterruptible Power Supply

measured in Volt-Amps

comes in online, standby, and line interactive

Question 13

Power Supply Voltages

Answer 13

AC
115/120V US
230V other

DC Voltages
3.3, 5, 12

Question 14

Most Common Power Supply Size

Answer 14

150 x 140 x 86 mm

Question 15

Component Voltage Uses

Answer 15

12v for HDD and OD
3.3 and 5 for onboard electronics

Question 16

Motherboard connector

Answer 16

20 or 24 pin P1 power connector

Some have 4, 6, or 8 pin for extra power

Question 17

Peripheral Power

Answer 17

Molex - 5V and 12V for fans and older drives, has chamfers

Mini - Berg connector, 5 and 12v to periphs - floppys

SATA - 15 pin connector, L Shape

Question 18

Splitters and Adapters

Answer 18

Create more connections

Question 19

ATX

Answer 19

Motherboard power and soft power

20 Pin P! plus molex or mini

Question 20

Rails

Answer 20

Over-current protection for power supply connections to components

Single or multi-rail means one or multiple OCPs

Question 21

Subtypes

Answer 21

ATX12V 1.3 added P4 extra 12v power, AUX connector 6 pin to supply 3.3 and 5v

EPS12V - server power supplies

Question 22

APFC

Answer 22

Active Power Factor Correction

eliminates harmonics

Question 23

Installing Power Supplies

Answer 23

Four standard screws
Always unplug an ATX system before doing work

Key or screwdriver short

Question 24

Cooling

Answer 24

Power-supply fan
Pulls air into PC

Case fans

Question 25

Maintaining Airflow

Answer 25

Closed case, slot covers

Question 26

Reducing Fan Noise

Answer 26

Specialty fans
Adjustability

Question 27

Troubleshooting Power Supplies

Answer 27

Sudden death or slow fail

Check with multimeter

Test every connection

Try a power supply tester if no mb

Question 28

Slow death of PS

Answer 28

Failures are intermittent

Just replace it

Question 29

Fuses and Fire

Answer 29

Class C extinguishers ONLY

Question 30

Redundant Power Supplies

Answer 30

Two used in a server, RPS, load is balanced between

Question 31

Modular Power Supply

Answer 31

Looks clean