Motoring

1. 14 February2014 Motoring Learning Objective To investigateelectric motors. Some • Explain why practical motors have a radial field produced by curved pole pieces. (A/B) Most • describe how this is achieved using a split ring commutator. (B) All • explain how the forces on a current carrying coil in a magnetic field produce a turning effect. (C) • All – explain how the forces on a current carrying coil in a magnetic field produce a turning effect. (C) • Most - describe how this is achieved using a split ring commutator. (B) • Some - Explain why practical motors have a radial field produced by curved pole pieces. (A/B)

2. To investigate electric motors Starter Robot wars. How do the robots work? What devices are needed to make them so agile and effective? • All – explain how the forces on a current carrying coil in a magnetic field produce a turning effect. (C) • Most - describe how this is achieved using a split ring commutator. (B) • Some - Explain why practical motors have a radial field produced by curved pole pieces. (A/B)

3. To investigate electric motors • All – explain how the forces on a current carrying coil in a magnetic field produce a turning effect. (C) • Most - describe how this is achieved using a split ring commutator. (B) • Some - Explain why practical motors have a radial field produced by curved pole pieces. (A/B)

4. To investigate electric motors • All – explain how the forces on a current carrying coil in a magnetic field produce a turning effect. (C) • Most - describe how this is achieved using a split ring commutator. (B) • Some - Explain why practical motors have a radial field produced by curved pole pieces. (A/B)

5. To investigate electric motors • All – explain how the forces on a current carrying coil in a magnetic field produce a turning effect. (C) • Most - describe how this is achieved using a split ring commutator. (B) • Some - Explain why practical motors have a radial field produced by curved pole pieces. (A/B)

6. To investigate electric motors The split ring commutator has one side that is always positive and one side that is always negative. The current through the coil changes direction every half rotation so that it rotates in the same direction. • All – explain how the forces on a current carrying coil in a magnetic field produce a turning effect. (C) • Most - describe how this is achieved using a split ring commutator. (B) • Some - Explain why practical motors have a radial field produced by curved pole pieces. (A/B)

7. To investigate electric motors Making a model motor – class practical Follow the instructions on the worksheet and answer the questions. • All – explain how the forces on a current carrying coil in a magnetic field produce a turning effect. (C) • Most - describe how this is achieved using a split ring commutator. (B) • Some - Explain why practical motors have a radial field produced by curved pole pieces. (A/B)

8. To investigate electric motors Worksheets on electric motors Complete all questions. • All – explain how the forces on a current carrying coil in a magnetic field produce a turning effect. (C) • Most - describe how this is achieved using a split ring commutator. (B) • Some - Explain why practical motors have a radial field produced by curved pole pieces. (A/B)

9. To investigate electric motors Plenary Why don’t we see more electric cars on the roads? In small groups, come up with a list of advantages and disadvantages of electric cars. • All – explain how the forces on a current carrying coil in a magnetic field produce a turning effect. (C) • Most - describe how this is achieved using a split ring commutator. (B) • Some - Explain why practical motors have a radial field produced by curved pole pieces. (A/B)