Lenzs law presentation f

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Lenzs law presentation f

  1. 1. Lenz’s Law
  2. 2. 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"
  3. 3. 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.
  4. 4. 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.
  5. 5. Formula • The Magnetic Fields Laws (Faraday) are: ε = - Ν (∆φ/∆t) = - Α (∆B/∆t) (Ν=number of coils, φ=Flux, t=time, Α=Area and Β=Magnetic Field Strength) • The important thing is the minus sign, which makes it an opposing EMF(ε).
  6. 6. Formula • The Magnetic Fields Laws (Faraday) are: ε = - Ν (∆φ/∆t) = - Α (∆B/∆t) (Ν=number of coils, φ=Flux, t=time, Α=Area and Β=Magnetic Field Strength) • The important thing is the minus sign, which makes it an opposing EMF(ε).

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