Jon Cannon
Unit
Volts
Defination
A measure of electrical
‘’pressure differential
A measure of electrical current
Amp or Ampere
OHM
A measure of resistance to
electricity.
Watt
A measure of electrical power.
- 1.
Computer Example
An AT power supply provides 4
separate voltage
A 17 inch moniter reqires 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 200 to 600 W
Volts are a measure of electrical "pressure" differential.
2. 120 Volts. It used to be 110 Volts.
3. Black for hot and white for ground.
4. 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.
A DC wall-wart (the little black plastic box you plug into the wall to
power an answering machine, cordless phone, etc.) has both.
5. +12V, -12V, +5V, -5V, +3.3V
6. To provide an additional 12V power supply to the processor
7. 24-pins
8. Case: Midsize and Full-size towers
Power supply: ATX power supply
9. 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.
10.
page 105 A+ Guide To Hardware Fourth Edition
page 157 A+ Guide to Managing & Maintaining Your PC, Sixth
Edition by Jean Andrews
11.
Because of the big electric charge held within the
capacitors inside it.
Jon Cannon
12.
───►├──
13.
A simple way to detect EMI is to use an inexpensive AM
radio into a low-frequency range next to the electronic device
14.
short or short circuit
15.
NLX
16.
Micro ATX, BTX, LPX or Mini-LPX, and NLX the most
common now is ATX
17.Adding and removing components,providing greater support,lowering costs
18. 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
20. 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.
19. Hard drive and monitor.
21. is an API developed by Intel and Microsoft which enables an operating system running an IBMcompatible personal computer to work with the BIOS (part of the computer's firmware) to achieve
power management
22. 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 powe If the computer is recently purchased, look for an "Energy Star" in the manual, or
during the boot screen of the computer. This ensures that the computer consumes a low
amount of energy when compared to the possible amount of energy any given computer can
consume.
23.The unit of measurement use to describe the amount of work a surge suppressor can do is
the Joules.
24.Most of the surge suppressor indicator lights only show if the power is present and turned
on. It does not add any other functionality in terms of surge suppression.
25.Stand by: battery powered circuit is used when AC input fails
Inline device: battery powered circuit is used continually
26.The smart UPS notifies the computer when power is switched to battery, it also notifies the
computer when the battery is almost discharged and the UPS won't be able to keep going. A
smart UPS can allow the computer enough time to shut down gracefully, without losing data.
Jon Cannon
27.Board size and expansion slots.
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, it’s also gives better structural support for the motherboard than does ATX.
r management