Electricity and Magnetism: Fields and Electromagnets
This lesson introduces Year 8 students to the fundamental principles of magnetism and the relationship between electricity and magnetic fields. Students will explore magnetic poles, field patterns, and the construction of electromagnets.
Learning objectives
- Describe the properties of magnets and the forces between magnetic poles.
- Map the magnetic field around a bar magnet using compasses or filings.
- Explain how to construct an electromagnet and identify factors that affect its strength.
- Compare and contrast permanent magnets and electromagnets.
Lesson plan (60 minutes)
Introduction · 5 min
Do Now: Mind map everything students know about magnets and batteries from KS2.
Direct Instruction · 10 min
Teacher-led explanation of magnetic fields, poles, and the link between electricity and magnetism.
Demonstration · 10 min
Demonstration: Visualising magnetic fields with iron filings and building a simple electromagnet.
Guided/Independent Practice · 20 min
Differentiated worksheet completion (Support, Core, Stretch).
Feedback · 5 min
Peer-marking of worksheets using the answer key.
Plenary/Assessment · 10 min
8-Question Multiple Choice Quiz.
Key vocabulary
- Magnetic Field
- A region around a magnet where a magnetic force can be detected.
- Pole
- One of the two ends of a magnet where the magnetic force is strongest.
- Electromagnet
- A temporary magnet made by passing an electric current through a coil of wire.
- Solenoid
- A coil of wire that acts like a magnet when carrying an electric current.
- Repel
- To push away (like poles do).
Core worksheet (first questions)
- Explain the 'Law of Attraction and Repulsion' regarding magnetic poles.
- How does a compass work?
- What is an electromagnet?
- Why is iron used for the core of an electromagnet instead of steel?
Quiz (sample)
1. What happens when two North poles are brought together?
- A. Attract each other
- B. Repel each other
- C. Do nothing
- D. Explode
2. Which of these is a magnetic material?
- A. Copper
- B. Aluminium
- C. Iron
- D. Gold
3. In what direction do magnetic field lines point?
- A. From North to South
- B. From South to North
- C. From East to West
- D. Up to Down
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