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Lenzs law presentation f

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Lenzs law presentation f Lenzs law presentation f Presentation Transcript

  • Lenz’s Law
  • What is it?
    • Lenz's law is named after Heinrich Lenz, and it says:
    • "An induced current is always in such a direction as to oppose the motion or change causing it"
  • Why?
    • It’s a way of understanding how electromagnetic circuits obey Newton’s Third Law... (For every action there is an equal and opposing reaction.)
    • It is basically just a minus (-) sign added onto Faraday’s Law.
  • What does it mean?
    • In everyday life one of the useful applications is Regenerative Braking.
    • This means that in some hybrid cars, when you press the brake the alternator is used to generate electricity which is used to recharge the battery.
    • The induced current through the alternator coil creates a magnetic field that acts against the magnetic field of the alternator.
    • This creates a braking force which helps slow the vehicle down.
  • Formula
    • The Magnetic Fields Laws (Faraday) are:  = -   t) = -  (  B/  t) (  =number of coils,  =Flux, t=time,  =Area and  =Magnetic Field Strength)
    • The important thing is the minus sign, which makes it an opposing  EMF  .