4-ELM-04
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Contents
Specification References
- 6.15 recall that a voltage is induced in a conductor or a coil when it moves through a magnetic field or when a magnetic field changes through it; also recall the factors which affect the size of the induced voltage.
- 6.16 describe the generation of electricity by the rotation of a magnet within a coil of wire and a coil of wire within a magnetic field; also describe the factors which affect the size of the induced voltage.
Starter
- recall that field lines flow from the North pole to the South pole.
- show students that you don't use a power supply, but when you move a wire up and down between two poles of a magnet, current will be recorded by a miliammeter.
Main Body of Lesson
- have a short 'brain storm' trying to explain how current appears in the circuit you have just shown them
- emphasize the fact that a power supply is NOT used and movements of the wire in between the two poles of the magnet have an important role.
- Anytime filed lines are cut, current is recorded by the ammeter
- If the wire is kept still in between the two poles of the magnet, no current is recorded, so there should a direct correlation between movements of the wire and recorded current.
- Whenever the wire moves, it CUTS the field lines and current is induced. This is Electromagnetic induction.
Plenary
Homework
- Complete Physics texbook - page 211 Q 1-3, page 213 Q1-3
Additional Information
Resources Required
- electromagnetic induction demos
Textbook References
- None
Website References
- None
Skills Addressed
Safety/Hazards
Notes
- None