Computer Hardware

What you are refering to is the use of a variable resistor. It has a shaft on it that when turned either clockwise or counter clockwise it dims or brightens the bulb. It does this by proportinally dropping voltage accross itself. However, a better method would be to use a series resonance circuit using an inductor and capacitor. This would dissipate less electrical energy as heat. Unfortunately, I can't send you a jpeg of this here but do a google for resonance and what you need will be there.

I'm not aware of any computer USB ports that remain powered when the PC is turned off. There are many available AC adapters for USB that would work with any electrical outlet, and these aren't very expensive.

Port speed is how fast the computer talks to the modem. Modem speed is how fast the modem talks across the phone line to the other modem.

The relationship between CAD (Computer aided design) and CAM (computer aided manufacturing) is that both types of designing need to be done on a computer and operated by an engineer.

No, it is a 32-bit processor in the sense of using 32-bit virtual addresses and having 32-bit general purpose registers and ALU that operates on those 32-bit GPRs. It does feature "MMX Technology", which can process 64-bits of information at a time by reusing the FPU's registers, however, in the more common usage, it is not considered a 64-bit processor due to the lack of 64-bit virtual address space and 64-bit GPRs.

the cd/dvd drive rotates the cd/dvd and moves a sensor called the lens in and out to find a section of the cd/dvd called a sector that contains a block of information, actually the inside of a floppy disc is circular too, try breaking the case off of one

2'160'000'000 cycles per second. 2.16GHz is probably referring to your processor speed. In simple terms 2.16GHz means it's good!

It refers to the 25-pin or 9-pin male serial port on the back of a PC.

"A serial port conforms to the interface standard called RS-232c (Reference Standard 232 revision c), which is why a serial port is sometimes called the RS-232 port. The maximum cable length for a serial cable according to RS-232 standards is 50 feet. This interface standard originally called for 25 pins, but because microcomputers use only nine of those pins, manufacturers often installed a modified 9-pin port."

-CompTIA A+ Guide to Managing & Maintaining You PC Sixth Edition

it could mean a ribbon cable or power cable is unplugged or not tightly in the places. It could mean they are plugged in the wrong IDE controller. Check those things, and if that does not work, I'd call a PC tech, so they can test it.

a hub

Most batteries are expected to last 3 to 5 years.

Assuming you have no guarantee left, you can buy a controller card (PCMCIA for laptops, in case you have a free slot). A very unlikely scenario is that someone has played a prank on you and disabled the USB ports from the BIOS, in which case they can be re-enabled.

Yes.

Now do your assignment yourself like everyone else.

The main advantage of the tower form factor is that you can put the main part of the PC on the floor. That way, you have more desk space. You can also use a higher desk or a larger monitor than you can with a console that sits vertically.

"CISC" stands for Complex Instruction Set Computer, CISC processor can execute complex instructions in one or more clock cycles. It is meant to differentiate it from a RISC or Reduced Instruction Set Computer, which can only perform one simple instruction in (usually) one clock cycle. A CISC is meant to have many machine level commands carried out as part of a single assembly command. The assembly command is broken into a series of "micro-code" commands which are executed internal to the processor by a "micro-code sequencer".

Socket is generally a software component that is used to connect a computer to the internet sites or to communicate with other computers. It contains address of the other side computer as well as the port number. Port number is the number that specify a particular process on that machine. As so many processes can be running on machine some time it is needed to specify a port. Many time it is optional.

The LCD screen itself does not generate enough light to be seen. It merely changes the color of light passing through it. The backlight provides this light. Much like a stained-glass window cannot show its brilliance without a light-source behind it, an LCD screen with no backlight is almost completely unviewable.

eSATA refers to a SATA port located externally near other onboard ports. Hard drives, SSDs, and optical drives can be connected to this.

It is a SATA port on the outside of the case.

This port is commonly found on cable DVR boxes as well in order to add additional storage capacity to the DVR cable box.

The NIC (network interface card) provides this interface.

Judging the speed of a computer by the size of it's power supply is not a good way of determining it's performance. You must consider the CPU type and speed, Memory type, speed and amount, and other hardware specifications.

Bigger is better

There are many things in the computer system main unit. This include all or some of the following:

1. Motherboard with processor, Boot Flash, RAM and add on cards as required for the system (may include a graphics card)

2. Hard disk drive for data storage

3. CD/DVD drive

4. Floppy drive

5. SMPS (power supply for AC-DC conversion)

6. Cables connecting various items and connectors

7. A small speaker/buzzer

- Neeraj Sharma

Ground the parking brake wire (green). Connect it to the ground wire (black)

It is a wireless card that operates off of AT&T's wireless edge network