Electromagnetic Induction

Electromagnetic Induction

1. Define

   • Electromagnetic Induction
   • Magnetic Flux
   • Mutual Induction
   • Self Induction

2. State

   • Unit of Magnetic Flux
   • Faraday's Law
   • Lenz's Law
   • What is an electrical generator?
   • What is a transformer?

3. Recall

   • A coil opposes a.c. with both its ohmic resistance and back emf induced in it.
   • A capacitor blocks d.c. but conducts a.c.
   • Electromagnetic Induction occurs in a generator
   • Mains electricity is a.c.

4. Draw

   • A graph of an a.c. voltage/current against time.
   • A graph of d.c. voltage/current against time.
   • A labelled diagram of a transformer

5. Explain

   • Induced emf
   • Induced current
   • Alternating current
   • Step up/down transformer
   • Primary/secondary coil

6. Describe

   • An expt to show electromagnetic induction
   • Demonstrate Faradays and Lenx's Laws
   • Show a.c. using an ocsilloscope
   • Show the effect of an inductor on a.c.
   • Show a capacitor conducts a.c. but not d.c.
   • Demonstrate the action of a transformer
   • compare peak and rms values of a.c.
   • Show mutual/self induction

7. Formulae

8. List

   • Practical Applications of Generators
   • practical uses of inductors
   • practical uses of transformers