MOUSE

  A Mouse is a handy device which can be moved on a smooth surface to cause the movement of a cursor on the screen.

it is a pointing device which is used to input data and information into the computer system by pointing on it. Physically, a mouse contains a small case, held under one the user’s hands with one or more buttons. For GUI-based system a mouse is an essential pointing device. The cursor of the mouse moves in the direction in which the mouse ball rolls. Although right now later rays is almost using in alter of track ball. Its name is derived from its shape, which looks a bit like a mouse, with its connecting wire that one can imagine to be the mouse’s tail. A mouse rolls on a small ball or by the laser and has two buttons on the top. When you roll the mouse across a flat surface on the screen, sensors the mouse in the direction of mouse movement. These are two type of mouse; these are A) Mechanical mouse, which use track ball to configure the pointer movement. B) Optical mouse, which uses laser rays to configure pointer movement.

SOUND SYSTEM:

        Sound system comes with two important parts; that the parts are A) Speakers and B) Microphones.

          Computer speakers, or multimedia speakers are external speakers, commonly equipped with a low-power internal amplifier which produces sound as output. External speakers are connected with a computer by using a plug and socket.

 Computer speakers range widely in price. Laptop computers have inbuilt speakers.

            A microphone is an acoustic-to-electric transducer or sensor and is used to convert sound signal into electrical signals. It was originally invented by Emile Berliner in 1877, and allows you to record voice or sound and place them onto computers, generally as a wave file. To connect a microphone we insert the plug of it into the back of the computer system. Integrated microphones can be found on laptops and some desktop monitors. These microphones are usually a small hole in front of the computer which when spoken into will record your voice and other sounds.

VIDEO CARD:

            A video card is an expansion card, which is used to produce output images to a display in a monitor. It main purpose is to generate graphical information. it is responsible for rendering the image on the monitor of a PC. It is also known as video adaptor, display adaptor or graphic card consists of a circuit board which holds several components such as graphics processing unit (CPU), video memory , video BIOS etc. video graphic array (VGA), digital visual interface, high definition multimedia port etc are the common connection points used between video card and display. Now a days, high performance video card are available, which has higher visual capability.

SOUND CARD:

           An audio card is an expansion card, which is used to produce output sound to a sound system. It main purpose is to generate audio information. it is responsible for rendering the sound in the sound system of a PC. It is also known as audio adaptor, sound adaptor. An audio card should be capable of playing the best quality sound. Now a days, high performance audio card are available, which has higher audio capability.