| Question |
Answer |
| The flow of electrons |
Electricity |
| material that permits the flow of electricity |
conductor |
| material that inhibits the flow of electricity |
insulator |
| force of electricity caused by difference in charge or potential at two different locations |
voltage |
| voltage is measured in |
volts |
| abbreviation for voltage |
v |
| typical voltage of computer components |
5V or 12 V |
| measure of the flow of electrions |
current |
| current is measured |
ampes |
| a completed circuit is called |
closed |
| an incomplete circuit is called |
open |
| current that flows in a single direction at a constant voltage |
DC (direct current) |
| current that flows repeatedly back and forth through the circuit |
AC (alternating current) |
| DC stands for |
direct current |
| AC stands for |
alternating current |
| In US, AC operates at |
60 hertz |
| term for measuring the AC cycles per second |
hertz |
| a force that opposes the flow of DC through a conductor |
resistance |
| force that opposes the flow of AC through a conductor |
impedance |
| resistance and impedance are measured in |
ohms |
| electrical power is measured in |
Watts |
| formula for measuring watts |
voltage times current |
| the property of electricity that poses danger |
current |
| formula for calculating volts |
v=i*r |
| in the formula for calculating volts, i stands for |
amps |
| A device used to measure multiple electrical properties |
multimeter |
| measures multiple electrical properties, and uses LCD or LED screen |
digital multimeter |
| measures multiple electrical properties and uses a needle and dial |
analog multimeter |
| excess positive or negative charges between two objects |
static electricity |
| device that converts wall voltage (110V or 220V) to DC voltages used in computers |
power supply |
| switch used to adjust the power supply to run on either 100V or 220V |
voltage selection switch |
| typical power requirement of a bare motherboard |
30W |
| typical power requirement per 128MB RAM |
10W |
| typical power requirement of P4 or higher procssors |
65W |
| typical power requirements for processes lower than P4 |
50W |
| typical power requirement for a hard drive |
5-15W |
| typical power requirement for a CD-ROM |
10-20W |
| typical power requirement for a floppy drive |
5-10W |
| typical power requirement for an adapter card |
5-30W |
| typical output voltage of AGB video cards |
+3.3V, 14A |
| typical output voltage of an ISA adapter card |
-5V, 0.3A |
| typical output voltage of a motherboard, CD/DVD drive, hard drives, PCI cards, and PIII or lower processors |
+5v, 30a |
| Typical output voltage of a powerswitch |
+5V, .85A |
| typical output voltage of older network adapters and serial ports |
-12V, 1A |
| typical output voltage of CD/DVD drives, Hard drives, P$ Athalon processes and motherboards |
+12V, 12A |
| typical power connector for peripheral devices |
Molex Connector |
| typical power connector for floppy drives |
Berg |
| Describes the size and shape of power supply |
form factor |
| the process of restoring a problematic AC signal to high-quality smooth signal that is safe |
power conditioning |
| strip used to filter out spikes and surges |
surge protector |
| used during blackouts to provide and condition power signal |
UPS |
| UPS stands for |
Uninterruptable Power Supply |
| a UPS that doesn't use power from the battery during normal operation |
standby UPS |
| UPS that uses power supply during normal operations |
continuous UPS |
| Problem: Computer fails to boot when powered on, but boots after pressing Ctrl+alt+delete |
replace power supply |
| Problem: Computer intermittently stops working or reboots |
add UPS or check wiring |
| Problem: Not enough power connectors to connect devices |
upgrade power supply |
| Problem: Computer fails to boot at all, no lights or beeps, no fans |
No power |
| Computer failes to boot, but fans start |
Confirm internal power connections and troubleshoot failed devices |
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