4.3.2

Logic Circuits

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Logic Circuits

Multiple transistors can be arranged together to make logic gates and logic circuits.

Logic gates

Logic gates

Multiple transistors can be arranged together to form more complex "switches" that only allow electricity to flow through if all or some of the transistors are "on".
These arrangements are called logic gates.

Examples of logic gates

Examples of logic gates

The AND gate performs the boolean AND function:
- It will only output true if both of its inputs are true.
The OR gate performs the boolean OR function:
- It will output true if either or both of its inputs are true.
The NOT gate performs the boolean NOT function:
- It takes one input and inverts it.

Logic circuits

Logic circuits

Logic gates can be combined to create complex logic circuits.
These logic circuits can perform functions such as adding numbers and storing data.

Logic Circuits

Multiple transistors can be arranged together to make logic gates and logic circuits.

Logic gates

Logic gates

Multiple transistors can be arranged together to form more complex "switches" that only allow electricity to flow through if all or some of the transistors are "on".
These arrangements are called logic gates.

Examples of logic gates

Examples of logic gates

The AND gate performs the boolean AND function:
- It will only output true if both of its inputs are true.
The OR gate performs the boolean OR function:
- It will output true if either or both of its inputs are true.
The NOT gate performs the boolean NOT function:
- It takes one input and inverts it.

Logic circuits

Logic circuits

Logic gates can be combined to create complex logic circuits.
These logic circuits can perform functions such as adding numbers and storing data.

1

Problem Solving

1.1

Algorithms

1.1.1Algorithm Thinking 1.1.2Interpreting Algorithms 1.1.3Expressing Algorithms - Pseudocode 1.1.4Expressing Algorithms - Flow Charts 1.1.5Correcting Algorithms 1.1.6Completing Algorithms 1.1.7Search Algorithms 1.1.8Linear Search 1.1.9Binary Search 1.1.10Sort Algorithms 1.1.11Bubble Sort 1.1.12Merge Sort

1.2

Decomposition & Abstraction

1.2.1Computational Thinking - Abstraction 1.2.2Computational Thinking - Decomposition 1.2.3End of Topic Test - Algorithms

2

Programming

3

Data

3.1

Binary

3.1.1Number Bases 3.1.2Negative Binary Numbers 3.1.3Binary Addition 3.1.4Binary Shifts

3.2

Data Representation

3.2.1Representing Text 3.2.2ASCII 3.2.3Unicode 3.2.4Representing Images 3.2.5Representing Sound

3.3

Data Storage & Compression

3.3.1Capacity 3.3.2Calculating Capacity Requirements 3.3.3Data Compression 3.3.4Run Length Encoding

3.4

Encryption

3.4.1Encryption 3.4.2Caesar Cipher 3.4.3Ciphers

3.5

Databases

3.5.1Databases 3.5.2End of Topic Test - Data & Representation

4

Computers

4.1

Machines & Computational Modelling

4.1.1Computational Models 4.1.2Input-Process-Output Model

4.2

Hardware

4.3

Logic

4.3.1Binary Systems 4.3.2Logic Circuits 4.3.3Boolean Logic 4.3.4End of Topic Test - Logic

4.4

Software

4.4.1Operating Systems 4.4.2User Interface Managetment 4.4.3Memory and Process Management 4.4.4File Management 4.4.5Device Management 4.4.6User Management 4.4.7Encryption Software 4.4.8Defragmentation Software 4.4.9Data Compression Software 4.4.10Backup Software

4.5

Programming Languages

4.5.1High Level Languages 4.5.2Low Level Languages 4.5.3Translators - Compilers 4.5.4Translators - Interpreters 4.5.5Translators - Assemblers 4.5.6End of Topic Test - Translation & Representation

5

Communication & The Internet

5.1

Networks

5.2

Network Security

5.2.1User Access Levels 5.2.2Encryption 5.2.3Protecting Against Malware 5.2.4Firewalls 5.2.5Forms of Attack 5.2.6Penetration Testing 5.2.7Malware 5.2.8How Malware Spreads 5.2.9Social Engineering 5.2.10Protecting Against Social Engineering 5.2.11Phishing 5.2.12Network Administration 5.2.13Network Forensics

5.3

The Internet & the World Wide Web

5.3.1IP Addresses 5.3.2Types of IP Address 5.3.3MAC Addresses 5.3.4Packet Switching 5.3.5How Do Packets Get Routed?5.3.6Did My Data Arrive Safely?5.3.7The Internet 5.3.8URLs 5.3.9DNS 5.3.10Web Hosting 5.3.11End of Topic Test - Security

6

The Bigger Picture

Jump to other topics

1

Problem Solving

1.1

Algorithms

1.1.1Algorithm Thinking 1.1.2Interpreting Algorithms 1.1.3Expressing Algorithms - Pseudocode 1.1.4Expressing Algorithms - Flow Charts 1.1.5Correcting Algorithms 1.1.6Completing Algorithms 1.1.7Search Algorithms 1.1.8Linear Search 1.1.9Binary Search 1.1.10Sort Algorithms 1.1.11Bubble Sort 1.1.12Merge Sort

1.2

Decomposition & Abstraction

1.2.1Computational Thinking - Abstraction 1.2.2Computational Thinking - Decomposition 1.2.3End of Topic Test - Algorithms

2

Programming

3

Data

3.1

Binary

3.1.1Number Bases 3.1.2Negative Binary Numbers 3.1.3Binary Addition 3.1.4Binary Shifts

3.2

Data Representation

3.2.1Representing Text 3.2.2ASCII 3.2.3Unicode 3.2.4Representing Images 3.2.5Representing Sound

3.3

Data Storage & Compression

3.3.1Capacity 3.3.2Calculating Capacity Requirements 3.3.3Data Compression 3.3.4Run Length Encoding

3.4

Encryption

3.4.1Encryption 3.4.2Caesar Cipher 3.4.3Ciphers

3.5

Databases

3.5.1Databases 3.5.2End of Topic Test - Data & Representation

4

Computers

4.1

Machines & Computational Modelling

4.1.1Computational Models 4.1.2Input-Process-Output Model

4.2

Hardware

4.3

Logic

4.3.1Binary Systems 4.3.2Logic Circuits 4.3.3Boolean Logic 4.3.4End of Topic Test - Logic

4.4

Software

4.4.1Operating Systems 4.4.2User Interface Managetment 4.4.3Memory and Process Management 4.4.4File Management 4.4.5Device Management 4.4.6User Management 4.4.7Encryption Software 4.4.8Defragmentation Software 4.4.9Data Compression Software 4.4.10Backup Software

4.5

Programming Languages

4.5.1High Level Languages 4.5.2Low Level Languages 4.5.3Translators - Compilers 4.5.4Translators - Interpreters 4.5.5Translators - Assemblers 4.5.6End of Topic Test - Translation & Representation

5

Communication & The Internet

5.1

Networks

5.2

Network Security

5.2.1User Access Levels 5.2.2Encryption 5.2.3Protecting Against Malware 5.2.4Firewalls 5.2.5Forms of Attack 5.2.6Penetration Testing 5.2.7Malware 5.2.8How Malware Spreads 5.2.9Social Engineering 5.2.10Protecting Against Social Engineering 5.2.11Phishing 5.2.12Network Administration 5.2.13Network Forensics

5.3

The Internet & the World Wide Web

5.3.1IP Addresses 5.3.2Types of IP Address 5.3.3MAC Addresses 5.3.4Packet Switching 5.3.5How Do Packets Get Routed?5.3.6Did My Data Arrive Safely?5.3.7The Internet 5.3.8URLs 5.3.9DNS 5.3.10Web Hosting 5.3.11End of Topic Test - Security

6

The Bigger Picture

Practice questions on Logic Circuits

Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.

1
Logic gates are commonly created to perform what kind of function?Multiple choice
2
Logic gates can be combined to perform actions such as:Fill in the list
3
A NAND gate is only false if both of the inputs are true. How can this be expressed in terms of AND, OR and NOT gates?Multiple choice
4
A NOR gate is true only when neither of the inputs is true. How can this be expressed in terms of AND, OR and NOT?Multiple choice

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Binary Systems

Boolean Logic