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Transcript
Starter: Suggest one practical idea to reduce the amount of noise transmitted into a flat through the walls and explain how your idea will work (2marks) • line / panel the walls with wood / plasterboard / increase the thickness of the plaster (on the walls) (1) • (this) will absorb / reflect (back) (most / some of) the sound (1) 25-May-17 The motor effect Explain the motor effect. State three ways of increasing the motor effect. Design a loudspeaker. an electric current in a magnetic field 25-May-17 an electric current in a magnetic field 25-May-17 demonstration 25-May-17 magnetic field lines 25-May-17 factors affecting the force 25-May-17 25-May-17 When a current is passed along a wire in a magnetic field, a force may be exerted on the wire 25-May-17 In the motor effect, the force is increased by: Increasing the current. Increasing the field. Placing the wire perpendicular to the magnetic field. 25-May-17 The direction of the force is reversed if either the direction of the current or the direction of the magnetic field is reversed. 25-May-17 25-May-17 How does a loudspeaker work? clip 25-May-17 Task: Workbook page 128, Q1-4