A child usually dreams of becoming a doctor, teacher, firefighter or even an astronaut in the future

Proper Sitting Position in Front of Computer

You should be sitting in a comfortable position when working at a Visual Display Unit. Some tips for adopting the best position to sit while working at a computer include:

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  Set the desk around 70cm high and keep a good sitting posture for your back, neck, and legs.
  
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  Use a chair with height adjuster, adjustable back height, and tilt mechanism.
  
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  Position the seat so that your eyes are level with the screen.
  
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  Ensure there is enough space to sit as comfortable as possible with your forearms in a horizontal position.
  
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  Avoid sitting in the same position for too long.
  
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  Use a footrest and wrist support (if needed).
  

Employers have a duty to make 'reasonable adjustments' for you if you are disabled. As a rule, it means providing special computer equipment or making alterations to suit your individual needs.

Employee Right to Free Eye Tests

Health studies have yet to show a real link between VDU use and eyesight damage. But, there are steps you can take if you feel that using a VDU screen makes your eyes tired.
The first step is to inform either your employer or an employee safety representative. As a rule, employees who use a VDU during working hours have the right to a free eyesight test.
An optician may prescribe wearing glasses to help workers who use display screen equipment. If so, the employer has a responsibility to pay for a basic pair of glasses if they are 'especially' needed for work.

Health Problems Caused by Computer Screens

Your employer must assess the risks involved with your job. They should pay special attention to safe computer use in the workplace. Part of that includes making sure the desks and equipment are comfortable for use. Inform your employer if you need any special equipment.

Multimedia hardware
Hardware for Storage and Backup
Whilst a multimedia title is being created, the separate working files are kept on the local hard drives of computers. It is important that consistent backups are made of the work. Backups are usually slow, and therefore done at night. In case of file corruption, a second copy of the work should be kept on the hard drive. A third copy of the work should be kept separate, in case of hard disk failure of computer thievery. A fourth should be kept off-site, in case of large disasters. Of course, all these copies should be kept up to date.
If a network is used by an organisation, then a central server can be used to backup the files of the organisation. Workers would also keep their own backup copy as a security measure, but the system administrator is responsible to backup the central server daily, and to have backups off-site as well. Most hardware that is used in multimedia is also used on other areas of computing.

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  CD-ROM
  

Multimedia advances are much further than that of storage technology. Because of this, storage changes will probably wipe out the CD-ROM (just as the floppy disk is now obsolete). It has been 5 years since Apple® have built their first computer without a floppy drive! Now, standard laptops combine a CD-ROM reading functionality with a DVD drive. The CD is considered to have a small storage capacity now; some games require 7 disks!

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  DVD
  

These have a higher storage capacity than CD-ROMs. A DVD stores up to 8.5 GB of data (it is possible to achieve twice this amount, if it is dual layered) on a 12cm in diameter disk.

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  USB Flash Drive
  

A USB flash drive is a storage device that consists of flash memory, with an integrated Universal Serial Bus (USB). USB flash drives are typically removable and rewritable, and physically much smaller than a floppy disk (USB's predecessors) . Most weigh less than 30g. As of this month, 256 gigabytes of storage are available and storage capacities as large as 2 terabytes are planned. USB's draw power from the computers they connect to. USB's are often used in the same roles as CD's and DVD's are, because of their small size and weight, portability, larger storage capacity as well as lack of moving parts. A flash drive consists of a tiny printed circuit board carrying the circuit elements and a USB connector, insulated electrically and protected inside a plastic, metal, or rubberized case which can be carried in a pocket or keychain. The USB connector may be protected by a removable cap or by retracting into the body of the drive, although it is not likely to be damaged if unprotected.
Hardware for display
Standard hardware for displaying multimedia include:

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  Cathode Ray Tube (CRT’s)
  

CRT’s, or visual display units (VDUs) control three different, focused electron beams. The red, green and blue beams strike tiny phosphor dots of pixels on a coated surface of a monitor, causing them to glow.

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  Liquid Crystal Displays (LCD’s)
  

LCD’s place liquid crystal between 2 polarising sheets. A current is employed at various points that change the characteristics of the light transmission at there respective points. These LCD’s give off no heat, radiation and glare.

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  Plasma Displays
  

Plasma displays use small colourful fluorescent lights that create an image when illuminated. As with CRT’s, they are made up of red, green and blue lights. To create a large scale of colours, the intensities vary. The image remains bright from every angle.

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  Touch Screens
  

Touch screens use a matrix of infrared beams in front of a screen. These locate a finger position, transmitting this in the same way a mouse pointer does. These are popular in public areas.

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  Data Projectors
  

Data projectors have a Digital Light Processor (DLP); with half a million separate controlled mirrors. These are used in conjunction with LCD technology. The image can be projected to a wall, or other open surface to provide a large display for an audience.

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  Speakers
  

Speakers use a coil of wire to produce a magnetic field. These in turn pull a cone of foil or cardboard in and out quickly. This movement produces sound waves.

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  Head-up Displays
  

Head-up displays project an image onto a screen within a helmet. In virtual reality (VR), these are popular for complete immersion.