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A+ Certification > ch8_PowerSupplies > Flashcards

ch8_PowerSupplies Flashcards

1
Q

What is voltage?

A

The pressure of electricity measured in Volts (V)

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2
Q

What is Amperage?

A

The amount of electricity moving past a certain point on a wire. Measured in Amps (a)

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3
Q

What is Wattage?

A

The amount of amps and volts needed to function a device. Measured in Watts (W)

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4
Q

What is Direct Current (DC)?

A

The Electrons move in one direction in a continous circuit

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5
Q

What is Alternating Current?

A

The electrons will alternate directions.

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6
Q

What is the difference between AC and DC

A

AC moves farther, DC is used by most devices

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7
Q

What is a continuity test do?

A

Checks if the electrons can move from one end to ther other end of the wire.

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8
Q

What does a resistance test show

A

An inifinite resistance means the wire is broken. a Good wire will show no resistance.

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9
Q

How can you determine an adapter is right for the device?

A
  • Amps, Volts, and Polarity must match.

- If the volts are too high it could burn out the device.

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10
Q

What does purpose does a surge suppressor serve

A

It absorbs the electricity that is not used.

  • Must have UL 1449 rating
  • Minimum 2000 joules
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11
Q

What is clamping voltage

A

during an overvoltage the suppressor will bring it down to a manageable level.

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12
Q

What is power conditioning

A

Can filter out RMI and EMI

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13
Q

What is a UPS and what purpose does it serve

A

Use of a battery during a power sag.

  • Watts = how much power they can supply
  • Volt-Amps = how much power it could supply if it was provided in a perfect way
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14
Q

What is an Online UPS?

A

Constantly powered through the battery

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15
Q

What is a standby UPS?

A

Devices will be powered by battery when voltage drops below 80-90 volts

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16
Q

What is Line interactive UPS?

A

Handles moderate sags and surges without needing to switch to battery.

17
Q

Waht voltages does the PSU supply

A

3,3 V, 5V, 12V (important ones)

18
Q

What is the common PSU size?

A

150mm x 140 mm x 86 mm

19
Q

What feature does a ATX power supply have

A

Soft power is always feeding 5 v to the motherborad to prevent the user from shutting the computer down before its ready to be shut down

20
Q

What features do the ATX 12V 1.3 have

A

An additional 4 pin 12v connector is needed by intel cpu

21
Q

What makes the EPS12V unique?

A

A 24 pin connector and an aux connector and a unique 8 pin connector
The PSU is not interchangeable

22
Q

What makes a Rails PSU unique

A

Over current protection will shut down the PSU if it goes beyond its cap.
Single Rail - monitors all pathways
Multi Rail - Monitor for each pathway

23
Q

What makes ATX12V2.0 Unique

A

The 24 pin connector is interchangeable with a 20 pin connector, but may not alwasy be compatible

  • 2 12 V rails are required if psu is higher than 230 W
  • CPU uses a 4 pin connector, but some motherboards may use a 8 pin connector
  • PCIe devices use a 6 or 8 pin connector
24
Q

What PSU is designed for SFF

A

Mini or Micro ATX

25
Q

What PSU is designed for low profile atx systems

A

TFX12V

26
Q

What PSU is designed for flex atx systems

A

SFX12V

27
Q

What PSU is designed for micro BTX systems

A

CFX12V

28
Q

What PSU is designed for low profile BTX systems

A

LFX12V

29
Q

What is harmonics

A

The electrical phenomena of current only flowing when fully pushed or pulled - cause of electrical buzzing

30
Q

What is the purpose of Power Factor Correction

A

Smooths out electrical current before being passed to the main circuitry

31
Q

What are the three efficiency ratings?

A 
Bronze = 85%
Gold = 90%
Platinum = 94%
32
Q

Where does the remaing percentage of efficiency get lost too

A

Heat

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