File Name: igcse information and communication technology by graham brown .zip
This edition now includes Brian Sargent in the expert author team, alongside first edition authors Graham Brown and David Watson. Supported by a Teacher s CD An essential companion to the Student s Book, featuring guidance and support for teaching the course including additional activities for use in class, as well as examination-style questions with model answers and a glossary. Evaluate the whole book After publication, you can evaluate the printed book or the Student etextbook for free, for 30 days.
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Alternatively find out more via your local Hodder Education representative, whose details you can find online. Visit to sign-up and learn more. Praise for the First Edition I think this book is a fantastic resource since it has clearly been written by people with an intimate knowledge of the requirements of this qualification and a determination to make it accessible to students and tutors alike.
As a study book it s friendly and easy to dip in and dip out of. It has all the latest developments in the IT world. I highly recommend this book for anyone involved in IT education. My copy is battered and worn, dog eared and bulging with notes and book marks. It is an excellent book filled with comprehensive notes. I have written a book on this syllabus but my students use that book for revision this book for standard class work. Computer systems are now commonplace in every part of our daily life.
This first chapter introduces the basic components that make up these computer systems, most of which will be described in much greater depth in later chapters. Basic components, including hardware both external and internal and software both application and system are all briefly introduced in the following sections.
A good analogy is to compare computers with books: the actual pages and ink used on the pages of a book are equivalent to the hardware used to make up computers; the words written on the pages are equivalent to the software.
Without the words, the book is useless. Similarly, without software, computers would be of little use to any of us. Hardware can be either external or internal. Software is a general term for the programs that control the computer system. There are two types of software: application and system. Examples of each are shown on the following pages. Figures 1. Further details about software can be found in the later chapters of this textbook. Hardware falls into two categories: external and internal.
External hardware input, output and storage devices is covered extensively in the following chapters of this textbook. Figure 1. Since it isn t always possible to see the internal hardware devices, the photographs in Figure 1. Text is entered using a keyboard and the software provides tools for copying, deleting and various types of formatting. Spreadsheet Spreadsheet software is used to organise and manipulate numerical data in the form of integer, real, date, and so on.
Numbers are organised on a grid of lettered columns and numbered rows. The grid itself is made up of cells, and each cell is identified using a unique combination of columns and rows for example, B6.
Some of the functions include: use of formulas to carry out calculations ability to produce graphs ability to do modelling and what if calculations. Database Database software is used to organise, manipulate and analyse data.
A typical database is made up of one or more tables. Tables consist of rows and columns. Each row is called a record and each column is called a field. This provides the basic structure for the organisation of the data within the database.
Some of the functions include: ability to carry out queries on database data and produce a report dbms add, delete and modify data in a table. Control and measuring software Control and measuring software is designed to allow a computer or microprocessor to interface with sensors so that it is possible to: measure physical quantities in the real world such as temperatures control applications such as a chemical process by comparing sensor data with stored data and sending out signals to alter process parameters for example, open a valve to add acid and change the ph.
They are usually downloaded from an Apps Store and range from games to sophisticated software such as phone banking. Photo editing software Photo editing software allows a user to manipulate digital photographs stored on a computer; for example, change brightness, change contrast, alter colour saturation or remove red eye. They also allow for very complex manipulation of photos for example, change the features of a face, combine photos, alter images to give interesting effects and so on.
They allow a photographer to remove unwanted items and generally touch up a photo to make it as perfect as possible. Video editing software Video editing software allows a user to manipulate videos to produce an edited video. Graphics manipulation software Graphics manipulation software allows bitmap and vector images to be changed. Bitmap images are made up of pixels that contain information about image brightness and colour. Bitmap graphics editors can change the pixels to produce a different image.
Vector graphic editors operate in a different way and don t use pixels. This type of software manipulates lines, curves and text to alter the stored image as required.
The type of editing software used depends on the format of the original image. The original program is called the source code and the code after compilation is called the object code. Once a program is compiled, the machine code can be used again and again to perform the same task without recompilation.
Linkers A linker or link editor is a computer program that takes one or more object files produced by a compiler and combines them into a single program that can be run on a computer. For example, many programming languages allow programmers to write different pieces of code, called modules, separately.
This simplifies the programming task since it allows the program to be broken up into small, more manageable sub-tasks. However, at some point, it will be necessary to put all the modules together to form the final program. This is the job of the linker. Device driver A device driver is the name given to software that enables one or more hardware devices to communicate with the computer s operating system.
Without drivers, a hardware device for example, a printer would be unable to work with the computer. All hardware devices connected to a computer have associated drivers.
As soon as a device is plugged into the USB port of a computer, the operating system looks for the appropriate driver. An error message will be produced if it can t be found. Examples of drivers include printers, memory sticks, mouse, CD drivers, and so on.
Operating systems OS The operating system OS is essentially software running in the background of a computer system. It manages many of the basic functions. Without the OS, most computers would be very user-unfriendly and the majority of users would find it almost impossible to work with computers on a day-to-day basis. Essentially, they are programs that help to manage, maintain and control computer resources.
Examples include: antivirus anti-spyware backup of files disk repair file management security screensavers disk defragmenter.
It allows the processor and other computer hardware to function and communicate with each other. One of the major functions of a typical motherboard is to act as a kind of hub that other computer devices connect to.
A typical motherboard consists of a sheet of non-conductive material, such as hard plastic. Thin layers of copper or aluminium are printed onto this sheet. These form the circuits between the various components. In addition to circuits, a motherboard contains several sockets and slots to connect the other components. This memory can be written to and read from. Since its contents are lost when power to the computer is turned off, it is often referred to as a volatile or temporary memory.
RAM stores the data, files or part of the operating system currently in use. It is often used to contain, for example, configuration data for a computer system. These chips cannot be altered and can only be read from hence their name. One of the main advantages is that the information stored on the ROM chip is not lost even when power is turned off to the computer. They are often referred to as non-volatile memories.
It usually connects to the motherboard see above. Video cards are usually made up of: a processing unit memory unit usually RAM a cooling mechanism often in the form of a heat sink since these cards generate much heat connections to a display unit monitor, television or projector. These sounds can be heard by the user either through speakers or headphones. Sound cards also allow a user to record sound input from a microphone connected to the computer, and to manipulate sounds stored on a disk.
Sound cards use two basic methods to translate digital data into analogue signals needed for speakers : FM synthesis mimics different musical instruments according to built-in formulas wavetable synthesis relies on recordings of actual instruments to produce sound.
Basically, hard disk drives HDD are magnetic in nature and are one of the main methods for storing data, files text, photos and music and most of the system and application software.
More modern computers and all tablets use newer storage systems that make use of solid state drive SSD technology and are replacing HDD in many cases. Their function is the same as HDD.
These will be discussed in more detail in Chapter 2, but examples are given in Table 1. Table 1. The central processing unit CPU is the part of the computer that interprets and executes the commands from the computer hardware and software. It is normally part of the computer motherboard.
Print Book. ISBN Cite this entry as: Information and Communications Technology. In: Tatnall A. This title was first published in The educational potential of information and communications technology ICT has been speculated upon endlessly - from the early days of the micro-computer to the present excitement surrounding virtual education and e-learning Now, with current multi-billi.
Assessment at a glance Candidates take: Paper 1 2 hours Written paper testing sections 1—8 of the syllabus and assessing the skills in Assessment objective AO2. It may also assess knowledge and understanding from sections 9—16 of. The Information Communication Technology syllabus combines theoretical and practical studies focusing on the ability to use common software applications, including word processors, spreadsheets, databases, interactive presentation software, e-mail, web browsers and website design. Write in dark blue or black pen. These materials will be available soon.
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