Today 29 aug 2016 is the first day of my semester 2 and the first subject is computer application.Our computer application lecture is friendly to us and she asked us about what is computer and telling us.
Chapter 1
What is a computer
- A computer is an electronic device,operating under the control of instructions stored in its own memory.
- It will collects data(input),processing and produces information(output).
- A computer contains many electric,electronic,and mechanical components known as hardware
- Input device-allows you to enter data and instructions into a computer.
- Output device-hardware component that conveys information to one or more people.
- System unit-case that contains the electronic components of the computer that are used to process data
- Storage device-record (writes) and/or retrieves (reads) item to and from storage media.
- Communications device-enables a computer to send and recevive data,instructions,and information to and from one or more computers or moblie devices.
Advantages of using computer
- speed
- reliability
- consistency
- storage
- communications
- health risks
- violation of privacy
- public safety
- impact on labor force
- impart on environment
Strategies include:
-Recycling
-Regulating the life of computers
-Extending the life of computer
-Immediately donating or properly disposing of replaced computers
Networks and the internet
- A network is a collection of computers and devices connected together,often wirelessly,vsa communications devices and transmission media.
- The internet is a worldwide collection of networks that connects millions of businesses,government agencies,educational institutions,an d individuals.
- People use the internet for a variety of reason:
-research and access information
-shop
-bank and inverst
-online trading
-entertainment
-download videos
-share information
-wed application
- A social networking web site encourages members to share their interests, ideas,stories,photos,music,and videos with other registered users.
