IT Theory IEB Grade 10 2020 Unit 6

Zeyn Mahomed Grade 10 2020




LU6 - Boolean Logic
1. Introduction

Boolean Logic ● Single switch is known as a bit
● TRUE is represented in a bit with a 1
● FALSE is represented in a bit with a 0

2. Boolean Logical Statements
Adapted from outside sources as well




AND
● Electronic Circuit that gives high output (1) if
all its inputs are high

● A dot (.) is used to represent AND

● (A.B) or is omitted (AB)


OR

● Electronic Circuit that gives high output (1) if
one or more of its inputs are high

● A plus (+) is used to represent OR (A+B)



NOT
● Electronic Circuit that produces an inverted
version of the input as its output (inverter)

● (A’) or (Ā)



NAND
● NOT-AND gate - outputs are high if any of
the inputs are low

● Symbol - AND gate with a small circle
(inversion) on the output



NOR ● NOT-OR gate - outputs of all NOR gates are
low if any of the inputs are high

● Symbol - OR gate with a small circle
(inversion) on the output




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