Computer Hardware-III

Power Supplies

Current : Flow of electric Charge or Flow of electricity or flow of electrons (negative

charged particles) through a conductor or wire.

AC             : Alternating Current (~): Flow of Electrons direction will be changed

  alternatively (OR) Polarity will be changed alternatively.

DC             : Direct Current (      ): Always Electrons will be flow in only one direction. (OR)

  polarity will not be changed.

AC Sources: 1. Mains, 2. Output from Stabilizer, UPS and Inverter, 3. Generator etc

DC Sources: 1. Cells,              2. Batteries,               3. AC / DC Adapters 4. Dynamos etc.

Voltage : An electromotive force or potential difference between two points on a circuit

Note: INDIAN VOLTAGE: 230V, 50HZ AC                           US VOLTAGE: 120V,

60HZ AC

Computer Hardware-II

Computer Parts and Peripherals

Computer Case / Chassis/ Cabinet

A computer case (also known as the computer chassis, box or housing) is the enclosure that contains the main components of a computer.

 Motherboard /Mainboard / Systemboard

The main printed circuit board in a computer that carries the system buses. It is equipped with sockets to which all processors, memory modules, plug-in cards,  daughter  boards,  or  peripheral devices  are connected.

 CPU / Processor

Central Processing Unit / Processor .The brain of the computer - the device capable of performing Arithmetic and Logical operations on data. Or for thinking.

     Display / Video Graphics Adapter

 

Display   Adapter   is   an   expansion card   which generates a feed of output images to a display. It converts digital signals into video signals.

 

Hard Disk Drive

 A hard disk Drive is a computer storage device that stores data on rotating magnetic surfaces permanently.

 

   Floppy Disk Drive

A  drive  that  reads  from  or  writes  to  separate diskettes  which  the  user  inserts.  Information  is stored on the diskettes themselves.

   

 Optical Disc 

Drive (ODD)

An optical disk drive is a storage device that uses light or lasers to store or retrieve information. Common types include CD or DVD drives.

Sound Card /Audio Adapter

A sound card is an internal  computer expansion card that facilitates the input and output of audio  signals to and from a computer under control of computer programs.

LAN / Ethernet Adapter

 

The Ethernet card provides a standardized way of connecting computers together to create a network.

MODEM  (Modulator and Demodulator)

A device that allows two computers to communicate over telephone lines. It converts digital computer signals into analog and converts the analog signal back into a digital format.

   TV / FM Card

A TV tuner card is hardware that allows analogue or digital broadcast television signals to be received and converted or translated for display by a computer.

Monitor

The monitor displays the video and graphics information generated by the computer through the video  card. Monitors are very similar to televisions with high resolution.

Keyboard

The keyboard is an input device designed to enter text,   characters   and   other   commands   into   a computer or similar device.

Mouse

The mouse is a part of a computer which provides the  major way  of  interacting with  graphical user interfaces on a computer.

Scanner

A device that reads a printed page and converts it into a graphics image (Soft Copy) for the computer.

Web Cam

Used  to  capture  images  and  videos  and  transfer them over Web or Internet

 

Microphone

A microphone, sometimes called a Mic (pronounced “mike”), is  a  device that converts sound into an electrical signal.

 Speakers

You need speakers to hear the sound generated by a sound card. You should buy speakers with a built-in amplifier to strengthen the sound signal and improve the performance.

 

Thumb Drive /Pen Drive / USB Flash Drive

A USB Flash Drive is used as a small, lightweight, removable data storage device. This hot-swappable, non-volatile.