By David Watson, Helen Williams
Recommended via Cambridge overseas Examinations. increase your scholars computational pondering and programming talents with entire insurance of the newest syllabus from skilled examiners and lecturers. - Follows the order of the syllabus precisely, making sure whole assurance - Introduces scholars to self-learning routines, supporting them the way to use their wisdom in new situations Accompanying animation documents of the main strategies can be found to obtain at no cost on-line. See the short hyperlinks to the left to entry. This publication covers the IGCSE (0478), O point (2210) and US IGCSE access (0473) syllabuses, that are for first exam 2015. it will possibly even be an invaluable reference for college kids taking the recent desktop technological know-how AS point direction (9608).
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The letter s after http refers to also often see the padlock sign http over secure. It is slower to use https than http; https is usually only adopted where sensitive or private data is being transferred across the internet. 5 Web browsers A WEB BROWSER is software which allows a user to display a web page on their computer screen. Web browsers interpret or translate the HTML code from websites and show the result of the translation. This can often be in the form of videos, images or sound. Most web browsers share the following features: • they have a HOME page • they have the ability to store a user’s favourite websites/pages • they keep a history of the websites visited by the user • they give the ability to go backward and forward to websites opened.
14 59 The output, X, will have a value of 1 if any of the following combination of conditions occur: • either turbine speed <= 1000 rpm and bearing temperature > 80°C • or turbine speed > 1000 rpm and wind velocity > 120 kph • or bearing temperature <= 80°C and wind velocity > 120 kph. Design the logic circuit and complete the truth table to produce a value of X =1 when any of the three conditions above occur. This is a different type of problem to those covered in Examples 1 and 2. This time a real situation is given and it is necessary to convert the information into a logic statement and then produce the logic circuit and truth table.
4 Universal Serial Bus (USB) The UNIVERSAL SERIAL BUS (USB) is an asynchronous serial data transmission method. It has quickly become the standard method for transferring data between a computer and a number of devices. Essentially, the USB cable consists of: • a four-wire shielded cable • two of the wires are used for power and the earth • two of the wires are used in the data transmission. When a device is plugged into a computer using one of the USB ports: • the computer automatically detects that a device is present (this is due to a small change in the voltage level on the data signal wires in the cable) • the device is automatically recognised, and the appropriate DEVICE DRIVER is loaded up so that computer and device can communicate effectively • if a new device is detected, the computer will look for the device driver which matches the device; if this is not available, the user is prompted to download the appropriate software.