BTA GRADE 11
JAMIE SHEN
1.Keyboard, pointing devices, scanning tools
An input device for a computer allows you to enter information. The most fundamental pieces of information are keystrokes on a keyboard and clicks with a mouse. These two input devices are essential for you to interact with your computer. Many other input devices exist for entering other types of information, such as images, audio and video. Input devices represent one type of computer peripheral - the other two types are output devices and storage devices.
2.The CPU(central processing unit,or,more commonly, “the processor”)performs this function.the CPU performs all necessary calculations,executes instructions contained in programs,and communicates with all the other components of your workstation to perform tasks such as saving files,displaying output,and printing documents.
3.monitors, CRTs.
Output devices allow our senses of sight, hearing, and even touch to be engaged in the work produced. Hard copy output allows us to touch the finished product as with printed documents.soft copy is seen on the monitor or stored on disk .
4.Impact interspersion images by striking a hammer against a ribbon,which then hits the paper,transferring the ink to the paper surface in a manner that is similar to the one used by typewriters.
Non-impact printer have replaced most of the impact printers in today’s workplaces.
5.A typical workstation in a business environment may contain a floppy disk drive, a CD-/DVD-ROM drive, and a hard drive. Additional storage is also available on the network server for authorized users.
6.To protect a disk from damage, keep it in a dry, temperature-controlled environment free of dust and smoke. Avoid any contact with strong magnetic field (sudh as on top of stereo speakers).
7.When you delete the files on your computer’s hard drive, are they really gone? Not necessarily. Until you empty the contents of the Recycle Bin or Trash Can the deleted files are still contained in these folders.
8.A network links two or more computers so that they can exchange data,and share resource and peripheral devices such as printers and scanners. There are many advantages to connecting these devices and people together.
9.A local area network is a group of computers that are connected in a small geographic region, such as within the same office building.
10.(1)Twisted pair cable: this is similar to the type of wire used to connect your telephone to the local telephone carrier.
(2) coaxial cable: this is similar to the cable that brings television transmissions into millions of homes around the world.
(3) fibre-optic cable: this is one of the fastest forms of data transmission.
11.(1)bus topology:
i cant put the pic in this file, so i will show you on class:)
(2)star topology:
(3)ring topology:
12. Every computing device, from your PDA to super-computing workstations , has an operating system(OS). Its job is to keep the hardware running efficiently and to allow communication with the hardware.