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Unit 1:Topic 1 (1.1 Output devices (CRT Monitor: It stands for cathode ray…
Unit 1:Topic 1
1.1 Output devices
CRT Monitor: It stands for cathode ray tube. It is a vacuum tube which contains one or more electron guns and a phosphorescent screen, and is used to display images. It modulates, accelerates, and deflects electron beams onto the screen to create an image.
TFT Monitor:A thin film transistor is a type of LCD flat-panel display screen in, which each pixel is controlled by one to four transistors. This provides the best resolution of all flat panel techniques, but it is also is the most expensive method.
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3D Printer:A machine allowing the creation of physical object from a three dimensional digital model, typically by laying down many thin layers of a material in succession.
Plotter:The plotter is a computer printer for printing vector graphics. In the past, plotters were used in applications such as computer-aided design, though they have generally been replaced with wide-format conventional printers. A plotter gives a hard copy of the output. It draws pictures on a paper using a pen.
Laser Printer:A printer linked to a computer producing good-quality printed material by using a laser to form a pattern of electrostatically charged dots on a light-sensitive drum, which attract toner (or dry ink powder). The toner is transferred to a piece of paper and fixed by a heating process.
Speaker:A device that converts analog audio signals into the equivalent air vibrations in order to make audible sound. When CRT monitors were the norm, speakers designed for computers were shielded to avoid magnetic interference with the CRT's magnetic coil. Getting Smaller All the Time.
Projector:A device that displays the computer’s output onto a white or silver fabric screen that is a wall, ceiling or a mounted tripod. It is widely used in classrooms and auditoriums for instructions and slide presentations.
Actuator:An actuator is often part of a computer control system. The actuator is a mechanical device or motor which carries out the action or decision made by the control system. For example the lens of this digital camera moves in and out according to how much zoom is wanted. This movement is controlled by an 'actuator'.
1.2 Computer components
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CPU:Then CPU performs the arithmetic and makes logical decisions at speeds up to billions of operations per second.
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RAM:Data that is frequently used is kept in ram so it can be accessed quickly by the computer’s processor.
Power Supply:The power supply converts mains AC to low-voltage regulated DC power for the internal components of a computer.
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Optical Drive:An optical drive is a type of computer disk drive that reads and writes data from optical disks through laser beaming technology.
BIOS:It's the program a personal computer's microprocessor uses to get the computer system started after you turn it on.
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1.4 Connectivity
Fibre optic cable: A cable consisting of one or more thin flexible fibres with a glass core through which light signals can be sent with very little loss of strength.
Coaxial cable:It's a type of shielded and insulated copper cable that is used in computer networks and to deliver cable TV services to end users.
Bluetooth:A standard short range, wireless interconnection of mobile phones, computers and other electronic devices.
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GSM:It’s a digital mobile telephone system, used across Europe and in other parts of the world
Satellite:An artificial earth satellite that facilitates communications, as radio, television, and telephone transmissions.
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