Download BTEC Nationals - IT Practitioners: Core Units for Computing by Howard Anderson, Sharon Yull PDF

By Howard Anderson, Sharon Yull

Complete insurance of all 6 center devices for the recent BTEC nationwide requirements from EdexcelBTEC Nationals - IT Practitioners is a brand new path textual content written particularly to hide the obligatory middle devices of the hot BTEC Nationals requisites, that are exchanging the present BTEC nationwide Computing scheme in 2002. scholars following all nationwide certificates and degree programmes in the new scheme will locate this publication crucial studying, because it covers the middle fabric they are going to be following in the course of the period in their path. Knowledge-check questions and actions are integrated all through, leading to a transparent and easy textual content which inspires self sufficient research. The assurance is designed to cater for college kids following a basic, ICT structures help, or software program improvement direction. solutions to numerical difficulties are incorporated, and extra aid fabric is accessible at the Newnes web site. 1.Written particularly to hide the middle devices for the recent 2002 BTEC Nationals from Edexcel in a single volume2.Student-centred method perfect for classes with a component of self sustaining study3.Clear, available sort perfect for college students without past history in computing.

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Additional resources for BTEC Nationals - IT Practitioners: Core Units for Computing and IT

Example text

E. the result of the logic. As you can see, only one line shows a 1, when A = 1 AND B = 1. In more formal terms, the truth table here shows the AND logic function. As there are two propositions, there are 22 = 4 lines in the truth table. If there were three propositions, there would be 23 = 8 lines. 1 How many lines would be in a truth table with eight propositions? A B C R 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 This shows all the possible combinations of the propositions, A, B and C, and shows R = 1 only when all three propositions (A, B and C) are true.

A proposition is a statement that is either true or false; it can have no other value. The statement or proposition ‘You are sitting down’ may or may not be true as you read this book, so it has the value true or false. ’, which could have a range of answers such as yes, no, I will in a moment etc. For the purposes of logic, the proposition ‘You are sitting down’ is either true or it is not, there are no other possibilities. It is usual to represent the value true as a ‘1’ and the value false as a ‘0’.

There will only be a 1 when both A AND B are 1. At this stage, you need only to consider the AND gate with inputs A and B: A B C D 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 1 1 1 1 1 E R Now fill in the column for proposition E, which is given by B + C; again, you need only consider the OR gate with inputs B and C: A B C D E 0 0 0 0 0 0 0 1 0 1 0 1 0 0 1 0 1 1 0 1 1 0 0 0 0 1 0 1 0 1 1 1 0 1 1 1 1 1 1 1 R Finally, fill in the column for the resultant, given by D NOR E: A B C D E R 0 0 0 0 0 1 0 0 1 0 1 0 0 1 0 0 1 0 0 1 1 0 1 0 1 0 0 0 0 1 1 0 1 0 1 0 1 1 0 1 1 0 1 1 1 1 1 0 The resultant column, R, shows that when A = 1, B = 0 and C = 0, the circuit will output a 1 etc.

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