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Electromagnetic Induction

Electromagnetic Induction. Motional Electromagnetic Induction Use a magnetic field to create a current emf (electromotive force) ~ potential difference Where does the energy come from? → work !. Electromagnetic Induction. Induction: a coil and a magnet

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Electromagnetic Induction

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  1. Electromagnetic Induction Motional Electromagnetic Induction Use a magnetic field to create a current emf (electromotive force) ~ potential difference Where does the energy come from? → work ! APHY101

  2. Electromagnetic Induction Induction: a coil and a magnet The amount of induced emf depends on 1. Strength of the magnetic field 2. Relative speed of the coil and magnet 3. Area of the loops 4. Number of loops More work is required to move the magnet through a coil with many loops. Why? APHY101

  3. Electromagnetic Induction Electric guitars The string oscillates above a permanent magnet and coil APHY101

  4. Electromagnetic Induction Magnetic flux The amount of a magnetic field that passes through a surface: ΦB = BA cosθ APHY101

  5. Electromagnetic Induction Faraday’s Law The emf is proportional to the number of loops times the rate of change of the magnetic field in the loops APHY101

  6. Electromagnetic Induction Generators Mechanical energy input with electrical energy output Opposite of electric motors APHY101

  7. Electromagnetic Induction Transformers Used to increase or decrease an alternating voltage Primary and secondary windings Step-up or step-down The iron core transfers the magnetic field from one coil to the other APHY101

  8. Electromagnetic Induction Transformers APHY101

  9. Electromagnetic Induction Transformers Power pole APHY101

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