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Electromagnetic Induction

Magnetic field lines going into screen. Wire 1. Electromagnetic Induction. Cutting a wire through a magnetic field induces a p.d. If a current is induced (need a circuit) this is the DYNAMO EFFECT We can increase the voltage by: moving the wire quicker having a stronger magnetic field;

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Electromagnetic Induction

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  1. Magnetic field lines going into screen Wire 1 Electromagnetic Induction Cutting a wire through a magnetic field induces a p.d. If a current is induced (need a circuit) this is the DYNAMO EFFECT We can increase the voltage by: • moving the wire quicker • having a stronger magnetic field; • using a coil of wire consisting of more turns or a larger area Solenoid

  2. 240 turns 2400 turns Secondary Coil Primary Coil Transformers p.d. across primary  = number of turns on primary      p.d. across secondary  number of turns on secondary Vp = Np Vs    Ns Only work using alternating current (a.c.) a.c. in primary coil induces a magnetic field. Magnetic field induces a p.d in the secondary coil

  3. Step up transformer Step down transformer Homes Power station Transformers and the National Grid Increases voltage Decreases voltage Low voltage = high current Can use in homes safely High voltage = low current so less energy lost

  4. Galaxies Evidence: Redshift CMB Neutrons and protons (~100s) BANG! Radiation Galaxies and stars (~few billion years) Quarks and electrons (~0.1s) GRAVITY DID IT!!! Hydrogen (H) and Helium (He) (~100,000 years)

  5. Tritium + Deuterium Helium Neutron Force of Gravity Force of Explosion How the chemical elements formed Nuclear fusion Hydrogen to helium Helium to heavier elements up to iron Too much energy is needed to make heavier elements in a star. To make heavier elements need a supernova!

  6. Foundation Paper Question 2 Question 3 Question 4

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