15 ELECTROMAGNETIC MACHINES Magnetic field patterns

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15 ELECTROMAGNETIC MACHINES Magnetic field patterns - PowerPoint PPT Presentation

15 ELECTROMAGNETIC MACHINES Magnetic field patterns. Investigate patterns of magnetic fields lines around magnets, wires and coils. Faraday’s law. Investigate the laws of electromagnetic induction. Transformer design. Review principles of transformer operation

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Presentation Transcript
15 ELECTROMAGNETIC MACHINESMagnetic field patterns
• Investigate patterns of magnetic fields lines around magnets, wires and coils
• Investigate the laws of electromagnetic induction
Transformer design
• Review principles of transformer operation
• Explain optimisation of transformer design in the context of magnetic circuits
Eddy currents and Lenz’s law
• Observe and explain the effects of eddy currents in terms of Lenz’s law
Dynamos and generators
• Explain the operation of dynamos and generators in terms of laws of electromagnetic induction
• Learn how generator design is optimised for maximum output
The catapult effect
• Observe and explain the forces on a current-carrying wire in a magnetic field
• Explain how this effect is used in d.c. electric motors
Building electric motors
• Build and test a simple d.c. Motor
Generators and motors compared
• Learn about similarities between them
• Derive the relation

F = I l B

Starter: Electromagnetism revision