Electromagnetic Induction in Magnetism Lessons

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Explore the principles of electromagnetic induction in magnetism lessons, covering topics like loudspeakers, microphones, transformers, and more. Understand how magnetic fields and moving conductors generate electrical currents, essential for future learning on generators and induction.

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Uploaded on Mar 18, 2025 | 0 Views

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L1 Introduction to magnetism L10 Loudspeakers & Microphones L2 Compasses L11 Transformers L3 EM practical L4 Solenoid L5 Force on a current carrying wire L6 Fleming LHR L7 Motors L8 Induced potential L9 Generator effect Lesson Sequence Pupils should have been taught to: Pupils will be taught: Students have learnt F-BIL, Fleming s LHR and motors. Emphasis should be that inducing potential is really the reverse of what they ve learnt previously. This learning will be consolidated in lessons on the generator effect, microphones & transformers. Future Learning Specification Prior Learning

SciDoc Induced potential Induced potential 18/03/2025 Last Lesson Last Term Last Year Stretch & Challenge I do We do You do Test I do We do You do Do Now

SciDoc Keywords Learning Objectives Keywords Current Commutator Flux density Motor Carbon brush Describe what causes electromagnetic induction. Explain how a current is induced. Describe the four ways you can increase the current from an AC generator. I do We do You do Test I do We do You do Do Now

SciDoc Electromagnetic induction Electromagnetic induction A potential difference or voltage is needed to make an electric current flow in a circuit: a coil of wire is moved in a magnetic field a magnet is moved into a coil of wire This is called electromagnetic induction and is often referred to as the generator effect. Stretch: How could we make the cone vibrate more strongly? I do We do You do Test I do We do You do LO:

SciDoc Induced current Induced current The induced voltage produces an induced current if the conductor is connected in a complete circuit. Stretch: A current of 2A is induced in a circuit. If the power in the circuit is 150 mW, calculate the resistance of the circuit. I do We do You do Test I do We do You do LO:

SciDoc Induced current Induced current What will happen if you move a magnet into a coil of wire? A current is induced in the coil. Only when the magnet is moving. I do We do You do Test I do We do You do LO:

SciDoc Induced current Induced current What happens when the magnet is in the coil? Nothing!! A current is only induced when the magnet is moving. I do We do You do Test I do We do You do LO:

SciDoc Induced current Induced current What will happen if you move the magnet out of the coil of wire? A current is induced in the coil. This time in the opposite direction. If you reverse the direction of the movement, then you reverse the direction of the current. I do We do You do Test I do We do You do LO:

SciDoc AC or DC? AC or DC? What will happen if you move a magnet in and out of the coil repeatedly? A current will be induced in the coil, the current will flow in one direction and then reverse and flow in the opposite direction. What type of current is this? Alternating current I do We do You do Test I do We do You do LO:

SciDoc AC generator AC generator What are the four ways you can increase the current from an AC generator? _____________________ Faster movement 1. _____________________ Stronger magnetic field More coils 2. 3. _____________________ Larger area of coils 4. _____________________ I do We do You do Test I do We do You do LO:

SciDoc Worksheet Worksheet Complete the worksheet I do We do You do Test I do We do You do LO:

SciDoc Basic answers Basic answers 1.A potential difference/voltage. 2.A coil of wire is moved in a magnetic field/a magnet is moved into a coil of wire. 3.If the conductor is connected in a complete circuit. 4.A current is induced. 5.No current is induced. 6.A current is induced is the opposite direction. 7.An AC current will be induced. I do We do You do Test I do We do You do LO:

SciDoc Medium answers Medium answers 8. Faster movement/stronger magnetic field/more coils/larger area of coils. 9. Magnetic field around the coil changes. 10. Because the magnet changes direction. 11. It is stationary. I do We do You do Test I do We do You do LO:

SciDoc Hard answers Hard answers 12. Gravity. 13. As the wire moves through the Earth s magnetic field [1] a potential difference is induced between the ends of the wire [1] the wire must be part of a complete circuit [1] 14.Twice the amplitude and twice the frequency I do We do You do Test I do We do You do LO: