Term
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Definition
| a unit of electrical potential difference across a conductor when a current of one ampere dissipates one watt of power. |
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Term
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Definition
| measure of resistance or electrical impedance |
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Term
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Definition
unit of electrical current or the measure of electrical flow
I = V / R
I is current (amps), V is voltage, R is resistance (ohms) |
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Term
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Definition
unit of power equal to one joule per second
P = V * I
P is power (watts), V is voltage, I is current (amps) |
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Term
*Power Supply Tasks:
Conversion of Voltage |
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Definition
| converting voltage from the building-supplied AC voltage to various DC voltages required by components inside the computer. |
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Term
*Power Supply Tasks:
DC Voltage Regulation |
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Definition
regulation to provide a very small tolerance of error to the devices receiving the power.
a +/- 5% voltage differential is allowed for 12VDC, 5VDC, and 3.3VDC |
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Term
*Power Supply Tasks:
Over-current protection |
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Definition
| power supply should handle some level of abnormally high current to prevent fuses in the power supply from blowing unnecessarily |
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Term
*Power Supply Tasks:
Input-under voltage |
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Definition
if voltage being supplied by the building drops below normal operating level, it shouldn't cause damage to power supply itself.
Causes the power supply to shut off |
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Term
*Power Supply Tasks:
Energy Star |
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Definition
| specification that defines how much power the power supply should provide to the computer components during reduced power states, when the comp is asleep or on standby. |
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Term
*Power Supply Tasks:
PS-ON# feature |
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Definition
| allows motherboard to control power supply through a soft power switch. |
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Term
*Power Supply Tasks:
power supply specification |
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Definition
| either recommends or requires the use of cooling fans depending on the form factor of the power supply |
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Term
*Power Supply Tasks:
Input supply voltage (120V or 240V) |
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Definition
| might be static or configured via manual switching or automatic switching. Many laptops have auto while most desktops have manual |
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Term
| *Power Supply provides Voltage at |
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Definition
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Term
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Definition
-The current specification of power supplies is ATX, and the ATX power supply will be found in one form factor or another on most current computers
- The main power connector has 20 or 24 pins. Four-pin floppy, and peripheral connectors supply 5V and 12V, and a five-pin SATA connectors supply 3.3V, 5V, and 12V.
- Power supplies convert 120VAC or 240VAC power into DC for the comp
- Power supplies come in a variety of power sizes, from 160W up to and beyond 1200W.
0 AC adapters are used in laptops to convert power from AC to DC, and usually automatically switch between 120V and 240V
- Surge suppressors, line conditioners, and UPS deal with various power supply problems, including surges and brownouts. |
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