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CompTIA A+ 220-801 220-802 Tables
Get Quizlet's official A+ Bundle (Core 1 and Core 2) - 1 term, 1 practice question, 1 full practice test
from CompTIA A+ Guide to PCs Pearson IT Certification
Terms in this set (25)
Value - volts. Checking AC voltage on a wall outlet (typically 120VAC). Checking the DC output voltage from a power supply (typically +/- 12, +3.3, and +/- 5 VDC).
Amps. Each device needs a certain amount of current to operate. A power supply is rated for total current in amps for each voltage level (such as 24 amps for 5-volt power and 50 amps for 12-volt power).
Ohms. Resistance is the amount of opposition to electric current. Resistance is used to check continuity on cables and fuses. A cable that shows little or no resistance has no breaks in it. A good fuse shows no resistance. If a cable has a break in it or if a fuse is bad, the resistance is infinite.
Watts. Watts is a measure of power and is derived by multiplying amps by volts. Power supply output is measured in watts. Also, A UPS (uninterruptible power supply) is rated in volt0amps. The size of UPS to purchase depends on how many devices will plug into it.
Main ATX power connector to the motherboard. +3.3, +5, +12, -12
Main power connector to the motherboard. +3.3, +5, -5, +12, -12
SATA connector. +3, +5, +12
Connects to peripheral devices such as hard drives and CD/DVD drives +5, +12
Connects to peripheral devices such as the floppy drive. +5, +12
G0 Working (S0)
The computer is fully functional. Software, such as the autosave function used with Microsoft products, can be optimized for performance or lower battery usage.
Requires less power than the G0 state and has multiple sleeping states: S1, S2, S3, and S4
CPU is still powered, and unused devices are powered down. RAM is still being refreshed. Hard disks are not running.
CPU is not powered. RAM is still being refreshed. System is restored instantly upon user intervention.
Power supply output is reduced. RAM is still being refreshed. Some info in RAM is restored to CPU and cache.
Lowest-power sleep mode and takes the longest to come up. Info in RAM is saved to hard disk. Some manufacturers call this the hibernate state.
Also called soft off. Power consumption is almost zero. Requires the operating system to reboot. No information is saved anywhere.
Also called off, or mechanical off. This is the only state where the computer can be disassembled. You must power on the computer to use it again.
The most common plan because it provides full power when you need it and saves power when the computer is not being used.
Saves power by running the CPU more slowly and reducing screen brightness.
Select the Show additional plans link to see this option. This provides the maximum performance possible.
Overvoltage. A spike lasts 1 to 2 nanoseconds. A nanosecond is one-billionth of a second. A spike is harder to guard against than a surge because it has such short duration and high intensity
Overvoltage> A surge lasts longer (3 or more nanoseconds) than a spike. also called transient voltage. Causes of surges include lightning, poorly regulated electricity, faulty wiring, and devices that turn on periodically, such as elevators, air conditioners and refrigerators.
Undervoltage. In a brownout, power circuits become overloaded. Occasionally, an electric company intentionally causes a brownout to reduce the power drawn by customers during peak periods.
Undervoltage. A sag occurs when the voltage from the wall outlet drops momentarily.
Undervoltage. A blackout is a total loss of power.
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