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This “Resistance & Ohm’s Law” PowerPoint lesson is designed for AQA GCSE Physics students, covering the concept of electrical resistance, its effect on current, and calculations using Ohm’s Law. The lesson includes theoretical explanations, real-world applications, and practice questions to build problem-solving skills.
Key Learning Objectives:
- Define electrical resistance as the opposition to current flow in a circuit.
- Describe the relationship between current and resistance (as resistance increases, current decreases).
- Calculate resistance using Ohm’s Law: R = V/I where R is resistance (ohms, Ω), V is voltage (volts), and I is current (amperes).
- Explain why resistance causes heating in circuits and how this affects electronic components.
Lesson Features:
The lesson starts with a starter activity, where students review current and voltage behavior in series and parallel circuits, reinforcing prior knowledge.
Core Topics Covered:
What is Resistance?
Resistance occurs when electrons collide with vibrating ions in a wire, slowing their movement and generating heat.
Explains why devices like smartphones heat up when in use.
Ohm’s Law and Resistance Calculation:
Step-by-step guidance on using the equation R=V/I.
Worked examples, such as calculating resistance for a bulb when given voltage and current.
Rearranging Ohm’s Law to solve for different variables (e.g., finding voltage or current).
Interactive Activities:
✔ Gap-fill exercises to reinforce definitions and key concepts.
✔ Practice calculations for resistance using Ohm’s Law.
Lesson Summary & Plenary:
Students answer key review questions, such as:
What is the unit of resistance, and how is it measured?
What happens to resistance as current increases?
File Details:
Format: Editable PowerPoint (.pptx)
Updated: February 2025
Aligned with: AQA GCSE Physics Specification
This lesson provides clear explanations, real-world applications, and engaging problem-solving exercises, making it an essential resource for understanding resistance and Ohm’s Law in GCSE Physics.
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Awesome resource. My students will appreciate the way the equations are broken down. This will definitely help them answer GCSE-style questions.
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