# Logic Gates

Logic Gates
Year 8
1 / 40
Slide 1: Tekstslide
ComputingLower Secondary (Key Stage 3)

In deze les zitten 40 slides, met interactieve quizzen en tekstslides. Lesduur is: 50 min

## Onderdelen in deze les

Logic Gates
Year 8

#### Slide 1 -Tekstslide

KO: Demonstrate an understanding of logic gates and Boolean logic
All
• To be-able to recognise the different logic gates.
• To be-able to understand the different logic gates.

Most
• To be-able to recognise the different logic gates and complete truth tables for them.
• To be-able to solve several gate problems.

Some
• To be-able to create a circuit using the different logic gates.
• To demonstrate a clear understanding of Boolean logic and Algebra.

Starter

#### Slide 4 -Tekstslide

What have you just seen?

Main Activity

#### Slide 6 -Tekstslide

Reminder - What is a Logic Gate?

A logic gate is a device that acts as a building block for digital circuits. They perform basic logical functions that are fundamental to digital circuit.

#### Slide 7 -Tekstslide

Reminder - What is a 'Truth Table'?

This is a way of representing the inputs of the gates in a table using Boolean representation – 1’s & 0’s, or true & false. Each logic diagram has its own unique truth table.

#### Slide 8 -Tekstslide

Reminder - What are the different Logic Gates?

AND, OR, XOR, NOT, NAND, NOR and XNOR.

#### Slide 9 -Tekstslide

What we are going to look at

AND Gate

NOT Gate

OR Gate

#### Slide 11 -Tekstslide

AND Gate - Diagram and Truth Table
Output is true if: All inputs are true

#### Slide 12 -Tekstslide

NOT Gate - Diagram and Truth Table
Output is true if:​ Input is false​
Output is false if:​ Input is true

#### Slide 13 -Tekstslide

OR Gate-Diagram and Truth Table
Output is true if:​  At least one Inputs is true

Logic.ly

Worksheet

#### Slide 15 -Tekstslide

More than one input...
AND Gate

#### Slide 17 -Tekstslide

More than one input
OR Gate

#### Slide 19 -Tekstslide

Multiple Gates
Gates can be connected to other gates for more complex circuits​
Below we can see an AND gate along with a NOT gate.

#### Slide 21 -Tekstslide

Multiple Gates
Below we can see an AND gate along with a OR gate.

#### Slide 23 -Tekstslide

What we have learnt so far...
• Truth tables represent what a binary output will be based on binary inputs and the currently used logic gate​.

• AND gates will produce a binary value of 1 when all inputs are a binary value of 1​.

• OR gates will produce a binary value of 1 when at least 1 input is a binary value of 1​.

• NOT gates will produce the opposite value of the input.

#### Slide 24 -Tekstslide

Boolean Algebra
What is 'Boolean Algebra'?

The text that describes the way the gates are connected.

#### Slide 25 -Tekstslide

How do we write this as an equation?

#### Slide 26 -Open vraag

How we need to write the equation...

#### Slide 28 -Tekstslide

How do we write this as an equation?

Y = NOT(A AND B)

#### Slide 31 -Tekstslide

How do we write this as an equation?

#### Slide 33 -Tekstslide

Y = (A AND B) OR C

#### Slide 34 -Tekstslide

What would be the expression for this?

#### Slide 35 -Open vraag

In your small groups you must research and create the remainder of the gates. I want an example and the truth table.

XOR, NOR, XNOR, NAND

Plenary

OR
NOT
AND

#### Slide 38 -Sleepvraag

What is the correct expression for the OR Gate?
A
Y = A OR B
B
Y = A OR C
C
A OR B = Y
D
Y = A - B

#### Slide 39 -Quizvraag

What is the correct expression for this?

A
Y = NOT (A AND B) OR C
B
Y = NOT A AND B OR C
C
Y = NOT A AND (B OR C)
D
Y = (NOT A) AND B OR C