An insulator or dielectric could be conveniently defined as a material that does not conduct electricity, if not the fact all known materials conduct a measurable amount of electricity. Nevertheless, insulators are readily distinguished from conductors. At room temperature, the conductivity of a good insulator typically is more than 20 orders of magnitude smaller than that of a good conductor and the difference becomes larger at lower temperatures.
The physics that underlies the vast difference between the electrical conductivity of insulators and conductors is the first topic considered. The above things that discusses are devoted to properties of insulators, including the importance of the insulator-electrode contacts in determining conduction processes. This article concludes with a brief description of some of the ways an insulator loses its ability to insulate when electrically stressed to the point of breakdown.
Imagine that you are viewing a videos film about an Antarctic expedition on your computer. It would be ideal if you can see the recordings of the expedition, hear a commentary on the expedition at the same time and listen to the conversation of the members of the expedition on your computer. All this and more is possible using a CD-ROM as a storage medium. The CDs used in a CD-ROM are similar to audio CDs and can store vast quantities of data---700MB or more.
To read a CD-ROM you need an input device called the CD-ROM drive. A CD-ROM can not be erased or written onto without the help of a special device called the CD-Recorder.
CD-ROMs are used whenever large volume of data needs to be stored and distributed. Databases on medicine, tourism, literature etc are available on CD-ROM s. Encyclopedia and dictionaries are also available on CD-ROMs.
To read a CD-ROM you need an input device called the CD-ROM drive. A CD-ROM can not be erased or written onto without the help of a special device called the CD-Recorder.
CD-ROMs are used whenever large volume of data needs to be stored and distributed. Databases on medicine, tourism, literature etc are available on CD-ROM s. Encyclopedia and dictionaries are also available on CD-ROMs.
The USB drive is a portable, easy to use and secure solution for transporting and sharing your data. USB stands for Universal Serial Bus. Lightweight and compact , the USB drive is incredibly small and can fit right into your pocket, requires no cables, power supplies or batteries. It plugs into any computer’s USB port.
To make it work, plug the drive into a USB port on your computer. It is plug and play for new version of operating system, but some operating systems, such as windows 95/98 do not automatically load the driver.
A single USB port can be used to connect up to127 peripheral devices, such as mice, modems, and keyboards. There are various types of USB length of drive , storing from 8Mb to more then 1GB.
To make it work, plug the drive into a USB port on your computer. It is plug and play for new version of operating system, but some operating systems, such as windows 95/98 do not automatically load the driver.
A single USB port can be used to connect up to127 peripheral devices, such as mice, modems, and keyboards. There are various types of USB length of drive , storing from 8Mb to more then 1GB.
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