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Huwebes, Agosto 25, 2011
Martes, Agosto 9, 2011
Lunes, Agosto 8, 2011
Chapter 3 Lesson 3 Summary
PC CARE AND SAFETY PROCEDURES FOR USERS
How to Take Care of your PC
1. Computers need a good working temperature to work properly. They need to be placed in a cool and dry place. You can maintain good temperature with an electric fan or air conditioning.
2. All the cables and connectors must be tied together to keep away from walk-ways to avoid accidents.
3. Refrain from eating in front of a computer. Food bits attract insects like ants and cockroaches that can penetrate the hardware and cause computer malfunction. Spilled drink, on the other hands, might cause short circuits.
4. Always use an AVR ( Automatic Voltage Regulator) to regulate the electricity. Too much electric voltage might cause the unit to short. Also, turn off computers during lightning as these can cause electrical surges to the computer.
5. Do not bump or drop the computer peripherals or components as any damage may cause them to malfunction.
6. Avoid clutter around your computer. Use soft cloth in cleaning your computer to avoid scratches.
7. Always scan for computer viruses. Internet connection and external storage often carry viruses that could damage files and cause computer malfunctions.
USER'S HEALTH RISKS AND PREVENTION
THE PROPER POSTURE WHILE USING COMPUTER
PC's are said to be "user-friendly," but this doesn't mean using them does not have health risks.
Good Working Habits
> Tap on the keys gently.
> Avoid long, undistubed periods of typing. You may take a short stretch breaks every 20 mins.
> Avoid long, undistubed periods of typing. You may take a short stretch breaks every 20 mins.
> Avoid staring at the monitor for long periods. Take vision breaks and do eye exercises.
Proper Workstation Design
>Position in a well-ventilated room.
> Use an adjustable workstation and an ergonomic computer chair.
> Place the monitor 16 to 24 inches away at eye level or slightly at a lower angle.
> Use extendable/retractable legs of the keyboard.
> Place mouse where it is easily accessible by your dominant hand.
> Use a documented holder to minimize vertical head move movements.
Proper Posture
> Sit up straight and put feet flat on the floor. Use a headrest if needed.
> Position your lower arms parallel with the floor and level to your keyboard, with elbows at your side.
> Keep wrists straight.
> Do not lean into tn\he monitor, but sit close enough to the keyboard and the mouse to stay relaxed.
Martes, Hulyo 26, 2011
History and Types of Computers
"HISTORY OF COMPUTERS"
The earliest civilizations already had concepts of number and counting. Representations vary from one civilization to another, thus, there is the Babylonian system, the Mayan system, the Egyptian system, the Hindu-Arabic system, the Roman system, were used in trade and simple calculations. But due to lack of convenient writing tools like pen and paper, these systems were not used in computations. Instead, the Romans used the abacus
From 1100 AD to 1500 AD, there was a debate between the supporters of the Roman Number system using the abacus and the Hindu-Arabic system using algorithm on which system was more efficient. The Hindu-Arabic system won.
TYPES OF COMPUTERS
Supercomputer--- this computer is considered the fastest computer and is used in science-related areas.
Mainframe Computers--- this is very expensive and large computer can support up to thousands of users at the same time.
Minicomputer--- this is a medium-powered computer that stands between a standard personal computer and a mainframe.
Workstation--- this type commonly used for desktop publication.
Personal Computer--- as the name suggests, this computer is designed for personal uses.
TYPES OF PC
Desktop--- this is a computer which is designed to fit comfortably on the top of a desk.
Portable Computers--- this includes computers that are small enough to be carried.
TYPES OF PORTABLE COMPUTER
Notebook--- this is small enough to easily fit to a briefcase.
Subnotebook--- this has a smaller keyboard and a screen slightly lighter and smaller, compared to a notebook computer
Laptop Computer--- this is one of the most popular portable computer.
Palmtop--- it can literary fit into your arm.
Personal Digit Assistant(PDA)--- a handheld device that combines computing, telephone or fax and networking features.
Supercomputer--- this computer is considered the fastest computer and is used in science-related areas.
Mainframe Computers--- this is very expensive and large computer can support up to thousands of users at the same time.
Minicomputer--- this is a medium-powered computer that stands between a standard personal computer and a mainframe.
Workstation--- this type commonly used for desktop publication.
Personal Computer--- as the name suggests, this computer is designed for personal uses.
TYPES OF PC
Desktop--- this is a computer which is designed to fit comfortably on the top of a desk.
Portable Computers--- this includes computers that are small enough to be carried.
TYPES OF PORTABLE COMPUTER
Notebook--- this is small enough to easily fit to a briefcase.
Subnotebook--- this has a smaller keyboard and a screen slightly lighter and smaller, compared to a notebook computer
Laptop Computer--- this is one of the most popular portable computer.
Palmtop--- it can literary fit into your arm.
Personal Digit Assistant(PDA)--- a handheld device that combines computing, telephone or fax and networking features.
Huwebes, Hulyo 21, 2011
Lunes, Hulyo 18, 2011
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