Magnetism in Action: Understanding Dynamos vs. Alternators

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Dive into the intriguing world of magnetism with a focus on dynamos and alternators. Explore the differences between these essential devices in generating electricity, grasp the concepts of induced potential, AC, and DC, and uncover the fascinating principles behind their operations. Enhance your knowledge and understanding of these fundamental components in the realm of electromagnetism.

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Uploaded on Feb 25, 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 induced potential and AC and DC. These ideas should be retrieved and built upon during this lesson. This learning will be consolidated in lessons on transformers. Future Learning Specification Prior Learning

SciDoc Alternators and dynamos Alternators and dynamos 25/02/2025 Last Lesson Last Term Last Year Stretch & Challenge I do We do You do Test I do We do You do Do Now

SciDoc Alternators and dynamos Alternators and dynamos Keywords Learning Objectives Keywords Current Commutator Flux density Alternator Dynamo Generator AC DC Describe what a dynamo is. Describe what an alternator is. Explain the difference between alternators and dynamos. I do We do You do Test I do We do You do Do Now

A dynamo is a DC generator. It is a DC motor in reverse. The direction of current does not change. SciDoc Stretch: How could we induce a larger voltage? In what devices might these be used? I do We do You do Test I do We do You do LO:

When the coil is moving parallel to the direction of the magnetic field, no potential difference is induced. SciDoc Stretch: When is a maximum potential difference induced? I do We do You do Test I do We do You do LO:

SciDoc Dynamo graph Dynamo graph Stretch: What would happen if we span the dynamo twice as fast? I do We do You do Test I do We do You do LO:

A alternator is an AC generator. It does not contain a split ring commutator. SciDoc Stretch: A current of 200mA is induced in a circuit. If the power in the circuit is 2W, calculate the resistance of the circuit. I do We do You do Test I do We do You do LO:

SciDoc What are the differences? What are the differences? What are the differences between alternators and dynamos? _____________________ Alternator is AC, dynamo is DC Dynamo has no split ring commutator 1. 2. _____________________ 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. An alternator. 2. Alternating current. 3. Generator effect. 4. Alternating current. 5. Voltmeter. 6. Potential difference (y axis) vs time (x axis). 7. Graph opposite way up. 8. Dynamo 9. Alternator is AC, dynamo is DC. I do We do You do Test I do We do You do LO:

SciDoc Medium answers Medium answers Q12. Wind turbines/steam turbines/dynamo on a bike. Rotation causes coil to turn in a magnetic field inducing a voltage. I do We do You do Test I do We do You do LO: