Chapter 2: Binary logic

OCR Computing for GCSE © Hodder Education 2011

What this chapter is about

In this chapter we discuss:• Why computers use binary• Logic gates• Truth tables

OCR Computing for GCSE © Hodder Education 2011

What you will learn

• Why computers use binary– What is meant by binary– The advantages of using binary

numbers in computers instead of the denary numbers that we are used to

OCR Computing for GCSE © Hodder Education 2011

What you will learn

• Logic gates and truth tables– What is meant by a logic gate– The three basic logic gates: AND,

OR, NOT– How to draw logic circuits– How to work out the result of a logic

circuit– How to summarise a logic circuit as

a truth table

OCR Computing for GCSE © Hodder Education 2011