Logic Gates & Truth Tables Uncovered
Year 10 Technology 60-minute lesson UK National Curriculum aligned
National Curriculum Alignment
OCR GCSE Computer Science Specification Computational Logic (Topic 1.4) Data Representation foundations Boolean algebra and binary logic Algorithm development for decision-making
Learning Objectives
Identify and describe 6 common logic gates Construct truth tables for single and multiple gates Understand real-world applications of logic gates Design simple logic circuits collaboratively Apply knowledge independently to solve problems
Starter: What Do You Know?
Look at these symbols What do you think they do? Write down your best guess Think about binary: 0 = false, 1 = true
The Six Essential Logic Gates
Truth Tables Explained
Truth tables show all possible input combinations Each row represents one scenario Columns show inputs (A, B) and output (Q) 0 = false/off, 1 = true/on Let's build one together for an AND gate
WE DO: Build Truth Tables Together
Work in pairs with your worksheets Start with the OR gate circuit Fill in each row step by step Discuss predictions before confirming Ask questions if you're unsure
Real-World Applications
{"left":"Security systems - multiple sensors must trigger alarm\nTraffic lights - pedestrian crossing logic\nAutomatic doors - motion AND safety sensors","right":"Computer processors - millions of logic gates\nSmart home devices - combining multiple conditions\nGaming controllers - button combination detection"}
YOU DO: Design Your Circuit
Independent challenge time! Design a circuit using at least 3 gates Create the truth table for your design Use the scenario: 'Alarm sounds when...' Work on paper or use digital simulators 15 minutes to complete
Differentiation & Support
Support: Logic gate flashcards available Partially completed truth tables provided Extension: Explore Boolean expressions Challenge: Circuit simplification techniques Digital simulators for visual learners Peer support encouraged
Exit Ticket Assessment
On your mini whiteboard, draw: 1. One logic gate symbol and its function 2. Complete this NAND gate truth table row: A=1, B=1, Output=? Show your answers when ready!
Next Steps & Reflection
Today we mastered basic logic gates and truth tables Next lesson: Boolean expressions and circuit optimization Consider: How do billions of gates work together in processors? Extension reading: Research logic gate applications Well done on your circuit designs!