IGCSE Physics Magnets and Currents

DC motor
1. Commutator
  1. allows motor to keep turning
  2. switch + to - , vice versa
2. drill, whisk, handheld fans
Transformers
1. transforms one voltage into a higher or lower voltage
2. primary coil
3. secondary coil
4. works by electromagnetic induction
  1. Changing magnetic field generates or induces voltage in wire or cell
  2. magnetic field around the coil is changing
5. step up transformer step down transformer
Attraction and Repulsion
1. N attracted to S
2. S and S repel each other
3. N and N repel each other
Generator/dynamo
1. works by rotating coil in a magnetic field
2. slip-ring communicator
  1. produces alternating current
right-hand grip rule
1. into page
  1. cross on arrow
2. out of page
  1. arrowhead
Fleming's left hand rule
1. FMC
2. for d.c.
  1. generator
    1. right-hand rule

Resource summary

	Created by nadiaNM about 10 years ago