Electromagnetic induction. From the syllabus Electromagnetic effects (a) Electromagnetic induction Describe an experiment which shows that a changing.

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Magnetism and Electromagnetic Induction

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Presentation transcript:

Electromagnetic induction

From the syllabus Electromagnetic effects (a) Electromagnetic induction Describe an experiment which shows that a changing magnetic field can induce an e.m.f. in a circuit (b) a.c. generator -describe a rotating-coil generator and the use of slip rings sketch a graph of voltage output against time for a simple a.c. generator

Extended -state the factors affecting the magnitude of an induced e.m.f. -show understanding that the direction of an induced e.m.f. opposes the change causing it

How a current can be induced Fleming’s Right-Hand Rule That the magnetic field must be changing for a current to be induced Lenz’s law. Chapter 36 : Electromagnetic Induction 1 Basics You should learn:

Induced current

Induced current in a coil

Fleming’s right hand rule

Notes Read p then close your book Define ‘electromagnetic induction’ What is Faraday’s law? Write down 3 ways to induce a larger current What is represented by each finger in Fleming’s right hand rule? Write down Lenz’s law Name 3 devices that use the principle of electromagnetic induction

Practice questions P311 Questions 3&6

Chapter 36 : Electromagnetic Induction 1 1.Explain how this microphone uses electromagnetic induction. 2.We can work out the direction of the induced current using F_______ ____-hand Rule.

Electromagnetic Induction 1 1.Explain how this microphone uses electromagnetic induction. 2.We can work out the direction of the induced current using F_______ ____-hand rule. Answers Fleming’s Right-hand Rule. Sound waves cause the diaphragm to vibrate…  diaphragm causes a coil to move in a strong magnetic field from a permanent magnet,  currents are induced in the coil,  currents flow along microphone cable to amplifier.

How a simple a.c. generator works, and the names of the parts Peak Voltage and Effective Voltage (RMS) for alternating current How a simple d.c. dynamo works, the parts, and the output waveform Induction is used in car speedometers. Chapter 36 : Electromagnetic Induction 2 Generators and Dynamos You should learn:

Output of an a.c. generator

Notes Read p304-7 then close your books What is alternating current? What is the relationship between effective value and peak value – use a diagram? List four ways to increase the emf of a generator Draw the voltage output for a d.c. dynamo.

Questions P310 Question 4,5&1