Unit
Volts
Amp
Definition
A measure of electrical “pressure
differential
A measure of electrical current
Ohm
A measure of resistance to
electricity
Watt
A measure of electrical power
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Computer Example
An at power supply provides 4
separate voltage
A 17 inch monitor requires less than
2 a to operate
Current can flow in typical computer
cables and wires with a resistance of
near 0 ohm
A computer power supply is rated at
2oo to 6oo w
Volts are a measure of electrical "pressure" differential.
120 Volts. It used to be 110 Volts.
Black for hot and white for ground.
A rectifier is an arrangement of diodes (half-wave or full-wave) that converts AC to pulsating DC. A
capacitor is used to smooth out the DC ripple for a more true DC supply.
A transformer is a device that changes the ratio of current and voltage.
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A DC wall-wart (the little black plastic box you plug into the wall to power an answering machine,
cordless phone, etc.) has both.
+12V, -12V, +5V, -5V, +3.3V
To provide an additional 12V power supply to the processor
24-pins
Case: Midsize and Full-size towers
Power supply: ATX power supply
The purpose of the ground wire on an appliance is to protect the user from electrocution and also to
prevent the wires in the circuit from getting so hot that they catch on fire, which could easily be the
cause of a serious house fire.
page 105 A+ Guide To Hardware Fourth Edition
page 157 A+ Guide to Managing & Maintaining Your PC, Sixth Edition by Jean Andrews
Because of the big electric charge held within the capacitors inside it.
───►├──
A simple way to detect EMI is to use an inexpensive AM radio into a low-frequency range next to the
electronic device
short or short circuit
NLX
Micro ATX, BTX, LPX or Mini-LPX, and NLX the most common now is ATX
adding and removing components easier, providing greater support for I/O devices and processor
technology, lowering costs.
1 PC appears death
2 PC sometimes halt during booting
3 Error code or beeps occur during booting.
4 You smell burnt part .
5 You do not hear the fan running
Hard drive and monitor
Hibernation. In hibernation, everything in ram is copied to a file on the hard drive and then the system shuts
down. Later, when a power button is pressed, the system does not have to go through the slow boot
process
is an API developed by Intel and Microsoft which enables an operating system running an IBM-compatible
personal computer to work with the BIOS (part of the computer's firmware) to achieve power management.
Not to easily since I cannot just seem to find the answer
the unit of measurement use to describe the amount of work a surge suppressor can do is the Joules
It's important a surge suppressor has a light indicator that says the suppressor part of the device is still
working. Otherwise, you might not have protection, but not know it.
25. stand by: battery powered circuit is used when AC input fails
inline device: battery powered circuit is used continually
26. donned
27. asked to identify the form factor of a motherboard, the two criteria you can use to help identify the board
are the location of the CPU and expansion slots and the type of power connection used for the
motherboard.
28. NLX LPX Mini LPX
29. Keep it clean.
Dust buildup on the heat sinks (especially the CPU) can cause it to overheat and potentially do permanent
damage.
30. The BTX is the answer the design focuses on reducing heat with better airflow and improved fans and
coolers, its also gives better structural support for the motherboard than does ATX. Answer #2 = The BTX
(Balanced Technology Extended) was designed to take full advantage of serial ATA, USB 2.0, and PCI
Express technologies. The BTX form factor focuses on reducing heat with better designed airflow and
implementing improved cooling fans and coolers.