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Do now!

Do now!. Can you read page 212 of your text book?. Last lesson. The motor effect and building a loudspeaker. The Motor Effect. When a current is placed in a magnetic field it will experience a force (provided the current is not parallel to the field). This is called the motor effect.

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Do now!

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  1. Do now! Can you read page 212 of your text book?

  2. Last lesson • The motor effect and building a loudspeaker

  3. The Motor Effect When a current is placed in a magnetic field it will experience a force (provided the current is not parallel to the field). This is called the motor effect. Can you copy this sentence into your books please.

  4. The Motor Effect The direction of the force on a current in a magnetic field is given by Flemming’s left hand rule. Thumb = Motion First finger = Field direction Centre finger = Conventional Current

  5. Building a loudspeaker These also use the motor effect Coil in here magnet

  6. Homework Pages 210 to 213. Answer the questions on all pages. Finish for homework due 15th October

  7. Today’s lesson • How the motor effect can build a motor • Electromagnetic induction

  8. Gather round!

  9. D.C.Motor Commutator ensures that every half rotation the current direction reverses in the coil brushes

  10. D.C.Motor

  11. Electromagnetic induction • Make a coil using wire. The coil should be wide enough to easily move a magnet inside

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

  13. Electromagnetic induction • MOVE a magnet in and out of the coil. Watch the meter! μA

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

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

  16. Electromagnetic induction A electric current is induced because the magnetic field around the coil is changing.

  17. Gather round Again?

  18. Generator/dynamo A generator works in this way by rotating a coil in a magnetic field (or rotating a magnet in a coil)

  19. Motor = generator If electric energy enters a motor it is changed into kinetic energy, but if kinetic energy is inputted (the motor is turned) electric energy is produced!

  20. Let’s try some questions! Pages 214 and 215.

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