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44 Cards in this Set
- Front
- Back
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The pressure of the electrons in the wire is called what? |
Voltage
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The amount of electrons moving past a certain point on a wire is called what?
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Current or Amperage
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The amount of amps and volts needed so that a particular device will function is expressed as what?
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Wattage
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what is the mathematical equation for electricity?
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Volts x Amps = Watts
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Resistance to the flow of electrons is measured in what unit of measurement?
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Ohms
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Electrons flow in
one direction around a continuous circuit is what type of current? |
DC (Direct Current)
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flow of electrons that go back and forth in a circuit is what type of current?
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AC (Alternating current)
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All power companies supply what type of current? why?
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Alternating Current power because AC travels long distances much more efficiently than DC.
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Most electronic devices use what type of current?
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DC (Direct current)
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In the United States, standard AC comes between what two amounts?
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110 - 120 Volts
often written as 115 VAC (Volts of Alternating Current) |
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Power supplies with voltage selection switches are referred to as what?
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Fixed-Input
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Power supplies that you do not have to manually switch for different voltages are known as what?
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Auto-Switching
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The IEC-320 plug has three holes, called what?
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1. Hot
2. Neutral 3. Ground |
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Which wire carries electrical voltage, much like a pipe that delivers water.
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The Hot Wire
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The "neutral" wire in an outlet carries what?
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No voltage, but instead acts like a water drain, completing the circuit by returning electricity to the local source, normally a breaker panel
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What is the purpose of the "ground" wire in an AC Plug/Outlet?
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The ground wire makes it possible for excess electricity to return safely to the ground.
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What type of device absorbs the extra voltage from a surge to protect the PC?
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Surge Supressor
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What type of device protects your computer in the event of a power sag or power outage?
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(UPS) Uninterruptible Power Supply
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What is a joule?
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A unit of electrical energy
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How much energy a surge suppressor can handle before it fails is measured in what unit of measurement?
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Joules
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Most authorities agree that your surge suppressor should rate at a minimum of how many joules?
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800 Joules
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All UPS's are measured in what 2 units of measurement?
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1. watts
2. volt-amps |
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The true amount of power a UPS supplies in the event of a power outage is measured in what unit of measurement?
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watts
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The amount of power the UPS could supply if the devices took power from the UPS in
a perfect way are measured in what units of measurement? |
volt-amps
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The power supply unit (PSU)converts high-voltage AC into what 3 DC voltages?
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5.0 Volts
12.0 Volts 3.3 Volts |
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Devices that need 5 or 12 volts of power are given power via what type of connectors?
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1. Molex Connector
2. Mini Connector aka Floppy Connector |
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What type of connector is this?
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Molex
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what type of connector gives power to the motherboard?
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P1 power connector
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what two pin counts do P1 connectors come with?
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20 pins
24 pins |
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How many pins do Molex connectors have?
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4 pins
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What type of connector is this?
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Mini connector aka Mini-Molex
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What type of connector is this?
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SATA Power Connector
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Generally how many pins does a SATA power connector have?
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15 pins
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Power is split into what three
primary DC voltage rails? |
12.0 volts
5.0 volts 3.3 volts |
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Circuitry in a power supply used to eliminate harmonics are called what?
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Active PFC (Power Factor Correction)
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Electrical current sometimes create a humming sound you hear from electrical components. What is this called?
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Harmonics
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What class fire extinguishers are for electrical fires?
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Class C
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What feature of ATX systems prevents a user from turning off a system before the operating system’s been shut down?
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Soft Power
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What occurs when power falls below minimum levels?
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Brownouts
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What type of plug goes in the back of a standard 110 volt power supply?
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IEC320 Plug
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Power connectors for ATX motherboard
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20 pin P1 conbector
2 miles/mini connectors |
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Power connectors for ATX12V 1.3
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20 pin P1 connector
4 pin P4 connector 6 pin AUX connector (supplies 3.3 and 5v current) |
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EPS12V Connectors
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24 pin motherboard connector
AUX connector ATX12V P4 connector 8 pin connector 12v non-ATX standard mainly for servers. |
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ATX12V power connectors
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24 pin P1 connector
No AUX connector SATA connectors 8 pin CPU connector 6 pin PCI Express power connector |
