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◦ Plotters
Plotter is an output device that helps in printing high quality poster, flex, visuals, charts,
graphs, tables and diagrams, etc. It can draw continuous lines and can produce output on
paper, polyester film or coloured transparencies. In a plotter, the figures are drawn by an
electronic pen which is driven by a motor. It uses inkjet cartridges (single or multicoloured)
to spray colours for drawing and sketching.
There are mainly two types of plotters: Drum Plotter and Flatbed Plotter.
• Speakers: Speaker is an output device that converts the electrical
signals into sound waves that we hear. In speakers, electric current of
the audio files is supplied to the magnet that pushes the diaphragm of
the speaker back and forth. This creates pressure and vibration in the
air and as a result sound is produced.
• Projector: A projector is an output device used to project the output from
a computer screen onto a large screen. It takes the input from a computer
in the form of an image and displays it on a wide screen. It is widely used
in schools, offices and cinema halls.
Storage Devices
Storage devices are used to store data on a computer. There are a number of storage devices
such as the hard disks, CDs, DVDs, Blu-Ray, and Flash Drive.
• Hard Disk: The hard disk is the most widely used internal storage
magnetic disk. It is made up of spindles of smooth metallic plates coated
with thin layer of magnetic material. Each plate of a hard disk is called a
platter. Each platter has two (read/write) heads, one on each side.
Over the years, hard disks have been available in various storage capacities. E.g. 20 MB in
earlier days to 160 GB, 320 GB, 500 GB, 1 TB, 5 TB, 6 TB, 12 TB, 16 TB and more in recent times.
The CPU can access data stored on a hard disk much faster than data stored on a CD.
• External Hard Disks are also available. They are the portable drives that
can be connected to any computer with the help of a USB port.
Info Byte
The first hard disk was introduced by Seagate in 1979, which could hold 5 MB of data.
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iPlus (Ver. 2.1)-VII

