Unit
Volts
Amps
Definition
A measure of electrical pressure
differential
A measure or electrical current
Ohm
A measure of resistance to
electricity
Watt
A measure of electrical power
Computer Example
An AT power supply provides
four separate voltages
A 17 inch monitor requires less
than 2A to operate
Current can flow in typical
computer cables and wires with
resistance of near zero
A computer power supply is
rated at200 to 600w
1. Volts are a measure of electrical pressure.
2. The normal voltage of house electricity in the U.S is
3. Hot wires in home wiring are normally colored black for hot and ground wires in computers are
normally colored white for ground.
4. The difference between a transform and a rectifier is that a rectifier is an arrangement of diodes
that converts AC to pulsating DC and a transformer is device that changes the ratio of a voltage
and current.
5. The five voltages produced by an ATX or BTX power supply are: +112v, -12v, -5v, and +3.3v.
6. The purpose of the 4pin auxiliary on the motherboard is to provide an additional 12v power
supply to the processor.
7. There are 24 pins that the main connector on the motherboard has.
8. The NXL motherboard uses a Midsize or Full size towers and power supply ATX.
9. The purpose of the ground line in a house circuit is to prevent uncontrolled electricity from
continuing to flow.
10. The transistor is the basic electronic building block of an integrated circuit.
11. The power supply is dangerous even after it’s disconnected because of the big electric charge
held inside the capacitor inside it.
12. The symbol for a diode is
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. The unintended high current closed between two points in a circuit is called a short circuit.
15. The form factor NLX is uses a rider card on the edge of the motherboard.
16. Four types of computer case forms are: NLX, ATX, BTX, and LPX. ATX and NLX are the most
common types used today.
17. Three advantages an ATX system has over has over a baby AT is it provides greater support for
I/O devices, cost less, and it improves upon At by making adding and removing components
easier.
18. Four computer symptoms that indicate a faulty power supply are: you don’t hear a fan running,
it sometimes halts during boot, an error code or beeps when booting, and you may smell a
burnt part.
19. .
20. Another name for ACPI standard S4 mode is hibernation.
21. .
22. You can tell if your computer complies with green standard by looking to see if in the manual it
talks about Energy Star.
23. The unit of measurements use to describe the amount of work that a surge suppressor can do is
the Joules.
24. It is important to have a light on the surge processor because it informs you that the device is
still working.
25. The two main types of interruptible power supplies are: a standby and an inclined device.
26. A smart UPS doffers from one that is not smart because it can notify the computer when the
power is switched battery and also notifies the computer when the battery is almost discharged
and the UPS won’t be able to keep going.
27. The criteria you can use to identify the board are: boar size and expansion slots.
28. Three motherboard factors that can be used with a compact case are: NLX, LPX, and mini LPX.
29. Something that you can do regularly to prevent a computer system from overheating is by
keeping it clean because the dust buildup can cause damage.
30. The BTX case form is best designed to keep a system cool.