Test over Magnetism- Friday

1
Test over Magnetism- Friday
2
Agenda for the day

• Lecture- Magnetic Induction
• Finish Lab from yesterday
• Making an electromagnetturn in
• Finish coloring magnetsphereturn in

3
Question of the day

• If you can make a magnet from electricity, can
  you also make electricity from a magnet?

4
Michael Faraday

• It was largely due to his efforts
  that electricity became practical for use in
  technology. His efforts created the ancestor
  of the electric motor and generators.
• Discovered electromagnetic induction (1831)
  .which was a turning point in physics

5
Electricity from Magnetism
6
Current is induced by changing the magnetic field

• Consider that there is no power source, but if
  you move the magnet or move the wirecurrent in
  created

7
REVIEW

• Which moves to create current? The wire or the
  magnet?

8
Does this mean we get something (energy) for
nothing?

• The law of conservation of energy states that the
  Force times the distance traveled Work done
• Work input work output (or energy stored)

9
What can you do to create more current?

• Faradays Law
• Increase the of loops
• Make the magnet or wires move faster

10
The Great RevolutionEinstein

• http//www.youtube.com/watch?vTEVEBzNSwTU
• And part 2