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  • Level: GCSE
  • Subject: ICT
  • Document length: 2187 words

A computer system consists of hardware and software.

Extracts from this essay...

Introduction

A computer system consists of hardware and software. Hardware is the equipment, which makes up the computer system. Hardware consists of: - Input devices such as keyboard, mouse, joystick - The Central Processing Unit (CPU) - Output devices such as a printer, monitor, graph plotter - Backing storage devices such as disc drive, hard drive - Media such as discs, tapes, paper etc There is hardware that I used is: * Mouse * Keyboard * Printer * Monitor * A tracker ball mouse A tracker ball mouse is an input device and similar to a mouse but the ball is set into a cup on the top of the unit. A finger or, on larger tracker balls the palm of the hand, is used to roll the ball in any direction. The ball controls the movement of the pointer on the screen. Buttons on the tracker ball work in the same way as mouse butons to activate processes on the screen. My alternative of using a mouse with a tracker ball would be a mouse without a tracker ball. Benefit: * A tracker ball does not require a large flat surface. Drawbacks: * Most people find them a bit fiddly * Not accurate * Not quiet ALTERNATIVE: Mouse without a tracker ball The pointer on the monitor screen mirrors the movement of the mouse by the user's hand.

Middle

Inkjet printer For printing my coursework the printer, which was used was an ink-jet printer. In an ink-jet printer, the print head contains tiny nozzles through which ink can be selectively sprayed onto the paper to form characters or the graphic images. Inside the print head are tiny piezoelectric crystals. These crystals change shape when an electric current is applied across them and this forces the ink out through the print head nozzle. My alternative would be a laser or dot matrix printer. Benefits: * They are quite good * Good quality output is produced * There is little extra cost for colour printing. Drawbacks: * A good quality paper is needed or the ink spreads. * The ink can be smudged. ALTERNATIVE: Dot-matrix printer A dot-matrix printer has a print head that travels across the paper. In the head are sets of pins, which shoot out, and strike the ink ribbon against the paper as the print head moves along. These printers produce low to medium quality black and white printing. Several years ago they were the ideal choice for a home printer but now the colour ink-jet has taken their place. They are still used in business for the following reasons: Benefits: * The running costs are very low.

Conclusion

* A formula allows calculations to be done on other cells. * Formulae and other data can be copied into groups of cells. * A variety of operations can be carried out on rows or columns. APPLICATIONS: of a spreadsheet * Displaying and calculating accounts and other financial information. * Performing calculations on data collected in experiments and surveys. * Performing calculations of data from which graphs can be drawn, e.g. * Calculating the average temperature for a graph of weather data. * A graph to solve a mathematical equation. Example software: Microsoft Excel This spreadsheet program is ideal for working out all of my costs. Its mathematical capabilities are very useful for this type of task. Advantages: * It has the option of typing formulae into the cells. These formulae will perform mathematical calculations that are quicker and easier than working it out in your head. * The formulae in the cells work with each other and with the cells, so if you change a cell or a formula, the other cells with formulae in them will change to compensate. * It can produce graphs with one click of the mouse. * It has a layout that is easy to use and to see. * It can be used to make simple tables. Disadvantages: * I can't think of any, this program has no faults. My alternative program would have been Lotus 123 but this program is not available to me.

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