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30 Cards in this Set
- Front
- Back
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Active PFC (active power factor correction)
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Circuitry built into the PSU that reduces harmonics.
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AC (alternating current) |
Electron flow alternates back and forth in a circuit.
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Amperage or current |
Measurement of electrons that flow past a certain point in a wire. Measured in amperes.
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Amps or A (amperes) |
Unit of measurement for electrical current.
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DC (direct current) |
Electrons flow in one direction around a continuous circuit.
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Dual-voltage |
PSUs equipped with a ~115/~230 switch. (110V-220V).
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FRU (field replacement unit) |
Typical replacement parts a tech should carry.
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IEC-320 |
Standard power connector for PSUs. ~115 V.
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Joule |
A unit of electrical energy. Measurement that a surge suppressor can absorb.
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Mini connector |
Supplies 5-V and 12-V to peripherals usually floppy DDs.
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Molex connector |
Supplies 5-V and 12-V current for fans and older drives. Keyed to prevent improper insertion.
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Multimeter |
VOM (volt-ohm meter) or DMM (digital multimeter). Can measure various aspects of voltage, amperage, and resistance.
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Multi-rail |
PSU configuration where current is split into multiple pathways. Each pathway receives it’s own OCP (over-current protection). 2 rail version is known as dual rail.
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Ω (ohms) |
Measurement of resistance (impedance).
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P1 power connector |
20- or 24-pin connector used for the ATX mobo.
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P4 power connector |
Additional 12V power supply to the mobo. Pentium 4 and later.
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PCIe 6/8 pin power connector |
PSU connector for dedicated graphics cards.
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Power conditioning |
Used to adjust AC power to standard prevent line noise such as EMI and RFI.
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Power supply fan |
Provides basic cooling for the PC.
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PSU (power supply unit) |
Converts AC power to DC into various voltages.
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Rails |
Separate DC voltage paths that lead to all connectors within an ATX PSU.
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Resistance |
Difficulty electricity has traveling through a medium. Measured in Ω.
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SATA power connector |
Serialized ATA, 15 pin, hot-swappable, thinner keyed cables for 3.3V(not currently implemented), 5.0V, and 12.0V devices.
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Single rail |
All power is supplied on a single pathway. Single OCP (over-current protection) monitors all the pathways.
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Slot covers |
Used to cover empty expansion bays and maintain proper airflow.
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Soft power |
Not an actual power switch. Used with ATX mobos. Can be configured in BIOS or OS.
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Surge suppressor |
Device that protects the PC from voltage spikes.
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UPS (uninterruptible power supply) |
Contains a battery and protects the PC in the event of power sag or power outage.
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V (volts) |
Measurement of pressure of electrons in a wire.
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Watts or W (wattage) |
The amount of amps and volts a device needs to function. V x A = W.
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