1. Do now! Can you continue with the ‘Draw the sentences’ from last lesson? This is to be FINISHED FOR HOMEWORK. Due next Friday 16th September.

2. Today’s lesson Plotting magnetic fields Electromagnetic induction

3. Plotting magnetic fields

4. Can you gather around Mr Porter? Quietly and sensibly

5. Plotting magnetic fields

6. Magnetic field lines The closer the field lines are, the stronger the magnetic force felt The arrows show the direction a compass needle would point at that point in the field.

7. Field around a bar magnet

8. Electromagnetic induction Can you carefully wind your wire around the cardboard tube?

9. Electromagnetic induction Put your coil in this circuit. The multimeter should be on the μA scale. μAμA

10. Electromagnetic induction MOVE a magnet in and out of the coil. Watch the meter! μAμA

11. Electromagnetic induction If a magnet is moved inside a coil an electric current is induced (produced)

12. Electromagnetic induction If a magnet is moved inside a coil an electric current is induced (produced) COPY this please!

13. Electromagnetic induction A electric current is induced because the magnetic field around the coil is changing (the coil ‘cuts through’ the lines of field). COPY this please!

14. Gather round

15. http://phet.colorado.edu/sims/faraday/gene rator_en.jnlphttp://phet.colorado.edu/sims/faraday/gene rator_en.jnlp

16. Generator/dynamo A generator works by rotating a coil in a magnetic field (or rotating a magnet in a coil). A slip-ring commutator produces alternating current (a.c.) Can you stick this in please?

17. COPY this please!

18. Let’s try some questions! Pages 215 and 219.