Comprehension and additional task exercises pages 188 and 189 from Next Page Science KS3 Complete. Accompanying PowerPoint and word searches available for free from the website.
This exercise covers:
• Electric currents produce magnetic fields
• The shape of a magnetic field for a current carrying: wire, loop, and coil (solenoid)
• How magnetic fields of solenoids can be made stronger
• Uses of electromagnets: electric bells, circuit breakers and picking up cars
• The electric motor simply explained with a pictorial including the point of the split ring
• The loudspeaker explained with a pictorial aid
• An exercise on how magnetic field strength changes with number of coils and current size
• An exercise deducing which way a motor will turn and whether faster or slower as current size and field direction changes
• A gap filling exercise explaining the operation of a loudspeaker
• Amazing WHAT? facts
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