Thin film transistor - Sample Essay

Hardware is a part of computer which can be seen and touched. Types of hardware There are 4 main types of hardware as shown below: Input: A hardware which is used to put data. Process: Turns input data into different type of data. Storage: A hardware which keeps data safe. Output: Takes out the input data from a computer. The list below shows which hardware’s I used: Input: keyboard, mouse and scanner. Process: 3. 0 GHZ processor. Storage: 512 MB RAM, USB, 80 GB SATA Hard disk. Output: monitor and printer. This table shows which hardware’s I used to complete my coursework. Name of device.

Price The way it works Advantages Disadvantages CRT Monitor i?? 19. 99 Pc world It contains millions of small blue, red and green phosphor dots which glow, when it is hit by an electron beam which goes across the screen to create an image which you will be able to see. http//www. howstuffworks. com CRT stands for Cathode Ray Tube. The picture on a monitor is made up of thousands of tiny coloured dots called pixels. The quality and detail of the picture depends on the number of pixels that the monitor can display. The higher the number of pixels, the better quality the output.

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It is very cheap compared to TFT monitors so people can afford them. It is a bit noisy so for libraries and offices it won’t be useful. It can handle a multiple resolution whereas a TFT cant. It creates to much heat which people don’t like. Because it is fatter than TFT monitors, it is harder for the screen to get damaged. Because it is so fat It needs a lot of room compared to TFT monitor. Mechanical Mouse i?? 2. 99 Pc world It has 2 wheels which are in touch with the ball. The wheels are set up at a 90i?? from each other so 1 senses the forward and backward while the other senses left and right.

http//www. howstuffworks. com By Using the mouse you can control what happens on the screen by moving and clicking the mouse and selecting items on the screen. It is very cheap compared to optical mouse so people can afford them. Dust and dirt can get inside the mouse to make it slow or get damaged Because it is not wireless it can’t get lost compared to a wireless mouse. To use the mouse you have to use it on a mouse mat or a special surface It is usually supplied with a computer when you buy the computer. Because it is not wireless you can’t use the mouse from a long distance compared to a wireless mouse.

Keyboard i?? 5. 99 Pc World When a button is pressed, the processor has to check the keys character and then send it through the cable to the monitor that it is connected to. http//www. howstuffworks. com The keyboard is the most common and widely used input device. It is made up of buttons called ‘keys’. The keys are arranged into sections: alphabet keys, F keys, Numeric keys and Arrow keys It is so cheap to buy and sometimes it comes supplied with the computer. If you use the keyboard so often it can lead to injuries such as R. S. I. It is so easy to use so people don’t need lot training.

Keyboards are not suitable for creating things. E. g. pictures, diagrams E. T. C There is a lot of different type of keyboards available. Each one for a different activity. Because it is not wireless, you can’t use it from a longer distance compared to a wireless keyboard. Handheld Scanner i?? 89. 99 Pc World It uses a light source, normally a cold cathode lamp to brighten the scanned imaged. The light is the reflected off the object and into charged couple device. http//www. howstuffworks. com Scanners are used to Change images or text on paper into a digital format that can be used by the computer.

Handheld scanners are normally a few inches wide and are held in the hand whilst they are rolled across the document to be scanned. Because Handheld scanners are small it doesn’t need a lot of space compared to a Flatbed scanner. It does not give high quality pictures so it is not very good for pictures. Images can be included on electronic documents after its been scanned. If the original image is bad, the final image will be bad as well. It is very fast and it’s more reliable than Flatbed scanners. Images can take up a lot of memory space. Laser Printer i?? 199. 99 Pc World.

A mirror reflects a beam of laser, and then lays them. A toner is then sprayed onto it. A paper is now pressed onto the toner and is slightly heated so that it sticks firmly on the paper http//www. howstuffworks. com They are used to create a hard copy of your work i. e. something that you can hold, hand to someone else or file away. It prints out very quickly compared to ink-jet and dot-matrix printers It is the most expensive printer especially the colour lasers. It prints out very fast compared to ink-jet and dot-matrix printers Because it is so big it takes up more space than ink-jet printers.

It has a high quality compared to ink-jet and dot-matrix printers It is very expensive to repair because of the complex parts inside. 512 MB RAM i?? 29. 99 Pc World Millions of transistors and capacitors are contained in a RAM. One of each join together to create a memory cell which represents a single bit of data. http//www. howstuffworks. com It stores modules that are needed to make your applications work. It is also needed so that you can have multiple windows open but if you have a lot of applications running then your computer will slow down.

It can open couple of windows at once which is good for quick use. If there’s less memory on the RAM the computer will be slow. It holds data and doesn’t lose it unless you close the computer. If there are a lot of windows open the computer will slow down because the RAM will be full. Modules are stored as well that are needed to make your applications work RAM with more memory will cost more than RAM with less memory. 512 MB Memory Stick i?? 1. 99 Pc World It works in a similar way to RAM. The only difference is that it saves and holds the data even when the computer is switched off.

It consists of a small printed circuit board which is packed up in plastic or metal casing. It usually has a removable cap which covers and protects the part of the stick which is inserted into a USB port. Its main purpose is that it is used to store data. It is small so it can be carried anywhere you go (portable) Because it is so small (potable) it can easily get lost. It is very reliable because it has no moving parts compared to CD’s and floppy Disks. The metal part at the front can snap If the USB is handled roughly. It holds more data than a floppy disk and some hold more than CD’s.

Dirt can get inside if the cap is not on the USB. 80 GB SATA Hard Disk i?? 29. 99 Pc World A drive creates the tracks and sectors at a low-level formatting. The sectors starting and ending points are written. When this happens the disk will be ready to save. http//www. howstuffworks. com The hard disk is the main storage device in your computer. All of your data files and applications software are stored on it. To access the data a platter spins thousand of times and a magnetic write and read head floats above the surface of the platter. Hard disks are measured in Gigabytes.

It has a very large storage capacity. It is much slower to access than ROM and RAMS chips. It stores and retrieves data much faster than a floppy disk or a CD-ROM. Hard disks can crash which stops the computer from working. It doesn’t lose items when computer is switched off. It is not easy to move to another computer because it is built in into a computer. 3. 0 GHZ processor i?? 125. 00 Pc World A clock inside the processor ticks every second which works out an instruction each time. It processes the input data that a person had previously worked on and changes it to another form like output data.

http//www. howstuffworks. com It is faster than a 2. 8GHZ processor. Because it is too expensive people won’t be able to purchase it. It makes it faster for people to work compared to 2. 8GHZ. It is fragile so it can break if not being careful. It can carry 3 billion (3,000,000,000) instructions per second. It is slower than a 3. 2GHZ which not good for people who play games for example. Alternatives This table shows the alternatives of the table above Name of device Alternative The way it works Advantages Disadvantage Difference it would make if used CRT Monitor TFT Monitor.

It contains millions of small blue, red and green phosphor dots which glow, when it is hit by an electron beam which goes across the screen to create an image which you will be able to see. http//www. howstuffworks. com TFT stands for Thin Film Transistor. A monitor displays the information on a screen. The quality and detail of the picture depends on the number of pixels that the monitor can display. The higher the number of pixels, the better quality the output. Because TFT Monitors are small it takes up less space than CRT Monitors. Because TFT Monitors are small it is easier to damage than CRT Monitors.

The difference it will make is that I would be able to work in peace because it is much quieter than CRT Monitors but a few pokes can damage the screen TFT Monitors are much quieter than CRT Monitors. It costs much more than a CRT Monitor so not everyone can afford it. It creates much less heat than CRT Monitors. A few pokes on the screen can cause lasting damage.

Mechanical Mouse Optical Mouse A sensor detects the light bounced of by the LED and sends it to the DSP. The (DSP) digital signal processing check how far the mouse has moved and sends instructions according to that to the computer. http//www. howstuffworks.com An optical mouse is used more often because it is fast and smooth.

By Using the mouse you can control what happens on the screen by moving and clicking the mouse and selecting items on the screen. It can work on nearly every surface because of the laser at the bottom. It cost much more than a mechanical mouse. The difference it will make is that I will not have to purchase any type of surface because it works on most surfaces but I won’t be able to use it from a longer distance because it is not wireless. It comes usually supplied with a new computer. Because it is not wireless it can’t be used from a long distance.

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