(1) PC (Computers):
1) In its more general usage, a PC (personal computer) is a computer designed for use by one person at a time. ...
personal computer: a small digital computer based on a microprocessor and designed to be used by one person at a time.
2) (Personal Computer) refers to a computer platform (language) used by the Windows, Unix and Linux Operating systems.
3) Any combination of processor, input device and output device designed for use by a single individual. Personal computers may also be called workstations. ...
Follow this link to know more about PC (computers):
http://en.wikipedia.org/wiki/Pc
(2) Laptops:
1) A laptop computer, or simply laptop (also notebook computer, notebook and notepad) is a small mobile computer, which usually weighs 2-18 pounds[citation needed] (around 1 to 8 kilograms[citation needed]), depending on size, materials, and other factors.
Follow this link to know more about Laptops:
http://en.wikipedia.org/wiki/Laptops
3) Modem:
1) A device (modulator/demodulator) that allows computer information to be sent over a telephone line.
2) Equipment that converts digital signals into analog signals for purpose of transmission over a telephone line. Signal is then converted back to digital form so that it can be processed by a receiving computer. Modems are typically used to link computers via telephone lines. ...
3) Acronym for MODulator/DEModulator. A device that transforms digital signals from the computer into electrical impulses for transmission over telephone lines, and does the reverse in reception.
4) A modem (from modulate and demodulate) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. A device that transmits digital data in tones over a phone line.
Follow this link to know more about Modem:
http://en.wikipedia.org/wiki/Modem
4) Monitor:
1) a device similar to a television screen that receives video signals from the computer and displays the information for the user.
2) A peripheral device with a screen for the visual display of information.
3) A display device resembling a television set but with a higher-resolution (sharper) image on the video screen.
The display screen of a computer
4) The high-resolution TV-like tube that displays your computer's output. Today's monitors have much better quality displays than any TV is capable of.
Follow this link to know more about Monitor:
http://en.wikipedia.org/wiki/Monitor
5) Mouse:
1) a hand-operated electronic device that controls the coordinates of a cursor on your computer screen as you move it around on a pad; on the bottom of the device is a ball that rolls on the surface of the pad; "a mouse takes much more room than a trackball"
2) In computing, a mouse (plural mice or mouses) functions as a pointing device by detecting two-dimensional motion relative to its supporting surface. Physically, a mouse consists of a small case, held under one of the user's hands, with one or more buttons. ...
3) A device that controls the movement of the cursor or pointer on a display screen. Input device that is connected to computer or keyboard that controls the movements of the cursor on the screen and can be used for making selections. Some have one button and some have two. ...
4) A hand-controlled hardware device for interacting with a computer terminal or entering data from a digitizer. A mouse is used to make selections and position the cursor to fields in computer forms when interacting with graphical user interfaces. ...
Follow this link to know more about Mouse:
http://en.wikipedia.org/wiki/Computer_mouse
6) Keyboard:
1) An input device similar to a typewriter, for the entry of text, numbers and punctuation. Input component of a computer system.
2) Normal PC keyboards can be taken a part and used to interface different switches, eg the above mentioned boat alarm sensors.
3) The main input devices connected to a computer. A keyboard is made up of individual keys representing individual letter, numbers, and symbols. Kilobytes A unit of measurement for the speed of data transferred. A common input device through which data and instructions may be typed into computer memory.
4) An arrangement of letter, number, and special function keys that acts as the primary input device to a computer.
Computer input device, similar to a typewriter keyboard on a typewriter but with extra function keys. Smaller keyboards with only maths-related keys are typically called "keypads".
5) An input device consisting of various keys that allows the user to input data, control cursor and pointer locations, and to control the dialog with the workstation.
Follow this link to know more about Keyboard:
http://en.wikipedia.org/wiki/IBM_PC_keyboard
8) UPS:
1) Short for uninterruptible power supply, a power supply that includes a battery to maintain power in the event of a power outage.
2) Uninterruptible Power Supply. A special power source which takes over in the event of a failure in the main power system.
3) An UPS (Uninterruptible Power Supply) is a system which allows computers and telephone systems to continue to run for a limited period of time during a power failure. It lets you save data from your computer before the whole system crashes. ...
4) This stands for Uninterruptable Power Supply, and it is a device that provides continuous, reliable power to your computer. It is a device that plugs into your outlets and you then plug your computer, monitor, and other components into.
5) Stands for uninterruptible power supply. A back up battery connected to a computer system that will supply power to the system if the electricity goes out. This allows users time to save work and shut down their systems safely.
Follow this link to know more about UPS:
http://en.wikipedia.org/wiki/Uninterruptible_power_supply
9) CPU:
1) (Central Processing Unit.) Your computer's engine. All the work of the computer is done in here. It's generally a square of ceramic measuring about 2" per side. Inside the ceramic is the chip itself, usually not a lot bigger than a thumbnail. Intel makes CPUs, as does AMD and Motorola. ...
2) The part of a computer which accepts and acts on instructions; where calculations are done and communications controlled. Also used generically for the computer's electronics (not terminals and I/O devices).
Follow this link to know more about UPS:
http://en.wikipedia.org/wiki/Cpu
10) Speakers:
1) A system comprised of drivers and a crossover network that accepts an audio signal from an amplifier and transforms that electrical signal into acoustic sound. ...
2) Converts an electrical signal from an amplifier into sound waves.
Follow this link to know more about UPS:
http://en.wikipedia.org/wiki/PC_speaker
Have a nice day...