Computer Science

an expression that evaluates to either True or False

an expression that is either True or False

a combination of logical operators and variables that is either True or False

Logic statements and expressions

Boolean logic and logic gates

Introduction to logic circuits

Creating logic circuits

Truth tables

Logic gate simulator software

Implementing Boolean logic in Python

In this unit pupils will discover that Boolean logic is a way of describing circuits inside a computer. They will recognise logic gates as the building blocks of processors. They will be able to construct logic diagrams, truth tables and simplify Boolean expressions.

Boolean logic

a data type that can have one of two possible values (True or False)

a combination of logical operators and variables 

a set of two or more logic gates to allow for more complex logic

an electronic component that carries out a logical operation

Match the terms to the correct definitions.

If A = True, B = True and C = False, which of these is a correctly evaluated expression?

What is output for this expression when A = True, B = False and C = False? NOT (A OR B) AND C

Label the output for this sentence: “If it is raining and not windy, I take an umbrella.”

Write this expression another way so that the logic is still the same: X = A OR (NOT B)

Write an expression for this sentence: “I’ll go swimming (S) if my friend (F) is coming and the pool (P) is open.”

What type of data does a logic gate process, where each value can only be True or False?

Which logic gate does the following symbol represent?

Which type of logic gate is used when the output is True when at least one input is True?

Both inputs need to be True in order give the output True.

Only one input needs to be True in order to give the output True.

The input must be False to give the output True.

We are building a truth table with two inputs for the expression A AND B. Put the inputs into the order most people would use to ensure all possibilities have been accounted for.

Which of these are inputs for this statement? “If it is after 9.45 PM on a weekday and it is not the school holidays, I will go to bed.”

Logic statements and expressions

Lesson outcome