Difference between revisions of "4-ELM-04"
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* 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. | * 6.15 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. | * 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. | ||
+ | * The current induced due to electromagnetic induction is alternating current (a.c.) | ||
+ | |||
+ | ==Plenary== | ||
+ | * Demonstrate electromagnetic induction using all other demos and encourage students to explain, step by step, how current is induced in each case. | ||
+ | * Discuss about the vast usage of electromagnetic induction: dynamos, generators. | ||
+ | * Use and discuss the ‘a.c.generator’ worksheet (Science Shared) | ||
+ | |||
+ | ==Homework== | ||
+ | * students to write about the differences and similarities between the ‘electric motor’ and the ‘a.c. generator | ||
+ | |||
+ | =Additional Information= | ||
+ | ===Resources Required=== | ||
+ | * electromagnetic induction demos | ||
+ | |||
+ | ===Textbook References=== | ||
+ | * ''None'' | ||
+ | |||
+ | ===Website References=== | ||
+ | * None | ||
+ | |||
+ | ===Skills Addressed=== | ||
+ | |||
+ | ===Safety/Hazards=== | ||
+ | * | ||
+ | |||
+ | ===Notes=== | ||
+ | * ''None'' | ||
+ | [[Category:Forces & Matter]] | ||
+ | [[Category:Practical skills - Obtaining]] |
Latest revision as of 12:18, 16 April 2010
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.
- The current induced due to electromagnetic induction is alternating current (a.c.)
Plenary
- Demonstrate electromagnetic induction using all other demos and encourage students to explain, step by step, how current is induced in each case.
- Discuss about the vast usage of electromagnetic induction: dynamos, generators.
- Use and discuss the ‘a.c.generator’ worksheet (Science Shared)
Homework
- students to write about the differences and similarities between the ‘electric motor’ and the ‘a.c. generator
Additional Information
Resources Required
- electromagnetic induction demos
Textbook References
- None
Website References
- None
Skills Addressed
Safety/Hazards
Notes
- None