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Custom A+ > Comptia A Ch.4 > Flashcards

Comptia A Ch.4 Flashcards

1
Q

antistatic wrist strap

A

A strap that connects a tech to a computer that equalizes the voltage potential between the two to prevent ESD

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2
Q

auto-switching

A

A type of power supply that monitors the incoming voltage from the wall outlet and automatically switches itself accordingly. Auto-switching power supplies accept voltages from 100 to 240VAC at 50 to 60Hz. They are popular in laptops and great for international travel.

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3
Q

amp

A

short for ampere, a measurement of current

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4
Q

Alternating Current (AC)

A

describes an electrical current in which the electrons flow in two, opposite directions. Type of electrical power from a wall outlet

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5
Q

AC circuit tester

A

device used to check a wall outlet’s wiring

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6
Q

ACPI (Advanced Configuration and Power Interface)

A

Technology that allows the motherboard and operating system to control the power needs and operation modes of various devices

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7
Q

Berg

A

type of power connector that extends from the computer’s power supply to a floppy drive

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8
Q

blackout

A

total loss of AC power

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9
Q

brownout

A

loss of AC power due to electrical circuits being overloaded

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10
Q

EMI (electromagnetic interface)

A

Electric noise generated by electrical devices. Also called EMR (electromagnetic radiation)

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11
Q

ESD (electrostatic discharge)

A

Occurs when stored up static electricity is discharged in an instantaneous surge of voltage. Cumulative effects weaken or destroy electronic components.

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12
Q

Energy absorption/dissipation

A

surge protector feature which describes that the greater number of joules that can be dissipated, the more effective and durable a surge protector is

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13
Q

grounding

A

Occurs when the motherboard or adapter is not installed properly and has a trace touching the computer’s frame.

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14
Q

dual-rail power supply

A

A term used to describe two +12 volt lines available in a power supply.

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15
Q

DC (direct current)

A

type of power a computer needs to operate

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16
Q

Clamping Voltage

A

voltage level at which a surge protector begins to protect a computer

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17
Q

Clamping Speed

A

time that elapses from an overvoltage condition to when surge protection begins

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18
Q

continuity

A

An electrical resistance measurement to see if a wire is good or broken

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19
Q

current

A

term that describes how many electrons are going through a circuit

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20
Q

capacitor

A

an electronic component that can hold a charge

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21
Q

I/O Shield

A

part that allows for optimum air flow and grounding for the motherboard ports

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22
Q

Line Conditioners

A

Device that protects a computer from overvoltage and undervoltage conditions as well as adverse noise conditions. Also known as power conditioner

23
Q

Li-ion Battery

A

A lithium battery, which is very light and can hold a charge for a long period of time. cell phones, cameras, etc.

24
Q

MOV (metal oxide varistor)

A

electronic component built into some surge protectors to absorb overvoltage spikes or surges

25
Q

Molex

A

type of power connector that extends from the computer’s power supply to various devices

26
Q

Modem Isolator (phone line isolator)

A

surge protector for modem, protecting against power fluctuations in phone line - also called phone line isolator

27
Q

Overvoltage

A

condition when AC voltage is over the rated amount of voltage

28
Q

ohms

A

measurement of electrical resistance

29
Q

resistance

A

a measure in ohms of how much opposition is applied to an electrical circuit

30
Q

RFI (radio frequency interference)

A

A specific type of EMI noise that occurs in the radio frequency range. Often results from operation of nearby electrical appliances or devices.

31
Q

Preventative Maintenance

A

something that is done to prolong the life of a device

32
Q

Phone Line Isolator (modem isolator)

A

Surge protector for the modem, protecting against power fluctuations in a phone line - also called modem isolator.

33
Q

Power Supply Tester

A

tool used to check DC voltages sourced from the power supply

34
Q

Power Good Signal

A

signal sent to motherboard from the power supply during POST that signifies power is acceptable

35
Q

Power

A

measurement expressed in watts that represents how much work is being done

36
Q

pin 1

A

A designated pin on every cable and connector that must be mated when attaching the two. Usually designated by stenciled or etched number, color stripe, etc.

37
Q

standoff

A

A plastic connector on the bottom side of a motherboard.

38
Q

scribe

A

plastic tool that helps with prying plastics parts or covers off laptop and mobile devices

39
Q

Standby Power (SPS - Standby Power Supply)

A

Power that is always provided, even when a computer is powered off - is why you have to unplug computer when working inside.

40
Q

Surge Protector

A

Device that helps protect power supplies from overvoltage conditions. Also called surge strip or surge suppressor.

41
Q

sag

A

momentary undervoltage condition that occurs when the wall outlet AC voltage drops

42
Q

spike

A

overvoltage condition of short duration and intensity - 1 to 2 nanoseconds

43
Q

surge

A

overvoltage condition like a spike but with longer duration - 3 or more nanoseconds

44
Q

Wake on Ring

A

A BIOS and adapter feature that allows a computer to come out of sleep mode when the telephone rings, so can accept fax, e-mail, etc.

45
Q

Wake on LAN

A

A BIOS and adapter feature that allows a network administrator to remotely control power to a workstation, and allows a computer to come out of the sleep mode.

46
Q

watts

A

electrical measure in which computer power supplies are rated - a measure of how much work is being done. Determined by multiplying volts by amps.

47
Q

volts

A

power supply’s output is measured in volts - also used to describe voltage from a wall outlet

48
Q

voltage

A

measure of the pressure pushing electrons through a circuit - measured in volts

49
Q

UPS (Uninterruptible Power Supply)

A

device that provides power for a limited time to a computer or device during a power outage

50
Q

UL 1449 VPR (Underwriters Laboratories voltage protection rating)

A

voltage protection rating standard developed by UL to measure max amount of voltage surge protector will let through to attached devices.

51
Q

undervoltage

A

condition that occurs when AC power drops below 100 volts, which may cause computer’s power supply to draw too much current and overload

52
Q

Type A-B-C Fire Extinguisher

A

fire extinguisher that can be used on Type A, Type B, or Type C fires

53
Q

Type C Fire Extinguisher

A

fire extinguisher that can be used only on electrical fires

54
Q

TVS Rating (transient voltage suppressing)

A

measure of surge protector’s ability to guard against overvoltage conditions - the lower the TVS, the better

Custom A+ (10 decks)

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