Sunday, 25 November 2012
Saturday, 24 November 2012
The Negative effects of computer
There are quite a few negative effects of using a computer. One of the prime ill effects of using a computer is the radiations emitted from the computer monitor.As we spend more and more time for our working hours on the computer, we are bound to suffer from severe backaches and other pains that are caused due to lack of regular movements. Constant usage of computers also brings about brain damage.
Games and web-sites with obscene content have immense effects on small children which turn them into computer addicts. Anti-Social elements like terrorist use computers for unlawful purposes. Hacking into e-mail accounts and personal computers and accessing and using personal information are also on a rise because of computers.
Another negative effect of computer to health is that you can get repetitive strain injuries in your hands and your wrist. It is a companies duty to ensure that you are using a computer safely and to minimise the harmful effects of computer usage. They should carry out a Health and Safety type assessment of the negative effects of computers, and ascertain if you are at risk of being affected. Necessary adjustments can be made such as a supportive chair for your back. It is important to have all your joints at 90 degrees to to desk and the floor, and to make sure that your screen is level with your eye height so as not to put unnecessary pressure on any joints or muscles.
definition of computer
A computer
Technically, a computer is a programmable machine. This means it can execute a programmed list of instructions and respond to new instructions that it is given. Today, however, the term is most often used to refer to the desktop and laptop computers that most people use. When referring to a desktop model, the term "computer" technically only refers to the computer itself -- not the monitor, keyboard, and mouse. Still, it is acceptable to refer to everything together as the computer. If you want to be really technical, the box that holds the computer is called the "system unit."
Some of the major parts of a personal computer (or PC) include the motherboard, CPU, memory (or RAM), hard drive, and video card. While personal computers are by far the most common type of computers today, there are several other types of computers. For example, a "minicomputer" is a powerful computer that can support many users at once. A "mainframe" is a large, high-powered computer that can perform billions of calculations from multiple sources at one time. Finally, a "supercomputer" is a machine that can process billions of instructions a second and is used to calculate extremely complex calculations.
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