CHAPTER 7. INDUCTANCE.ppt - ChaPtE R7 INDUCTORS SCOPE OF STUDY 7 main sub topics that you should learn and understand are Faradays Law Lenz Law

CHAPTER 7. INDUCTANCE.ppt - ChaPtE R7 INDUCTORS SCOPE OF...

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INDUCTORS & INDUCTORS & INDUCTANCE INDUCTANCE ChaPtE ChaPtE R 7 : R 7 :
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SCOPE OF STUDY SCOPE OF STUDY 7 main sub topics that you should learn and understand are : Faraday’s Law Len’z Law Induction Inductors and Inductance Energy Stored in Magnetic Field RL Circuit LC Circuit
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FARADAY’S LAW FARADAY’S LAW DEFINITION The emf induced in a circuit is equal to the rate of change of magnetic flux through the circuit The emf induced in a circuit is equal to the rate of change of magnetic flux through the circuit
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FARADAY’S LAW FARADAY’S LAW EQUATION emf, ε = ∆ Φ B ∆t emf, ε = N∆ Φ B ∆t where : Φ B = magnetic flux t = time N = number of loops
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FARADAY’S LAW FARADAY’S LAW Φ B = B . A = BA cos ϴ Magnetic flux (Wb @ Tm 2 ) Magnetic field (Tesla,T) Area (m 2 ) Angle between B and A
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FARADAY’S LAW FARADAY’S LAW
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FARADAY’S LAW FARADAY’S LAW Changing magnetic flux produces an emf (or changing B-Field produces E-Field) The rate of change of magnetic flux is required
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FARADAY’S LAW FARADAY’S LAW Magnetic field around a permanent magnet. B
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FARADAY’S LAW FARADAY’S LAW Interaction of two permanent bar magnets.
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FARADAY’S LAW FARADAY’S LAW Bar magnet moves through coil Current induced in coil v S N Change pole that enters Induced current changes sign v N S Bar magnet stationary inside coil No current induced in coil N S
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FARADAY’S LAW FARADAY’S LAW Coil moves past fixed bar magnet Current induced in coil v S N a b Switch closed (or opened) current induced in coil b Steady state current in coil a no current induced in coil b
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FARADAY’S LAW FARADAY’S LAW Conclusion:A current is induced in a loop when:
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FARADAY’S LAW FARADAY’S LAW Faraday's law in
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FARADAY’S LAW FARADAY’S LAW
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