This REVISION lesson contains an engaging powerpoint (45 slides) and is fully-resourced with associated worksheets. The lesson uses a range of activities which include exam questions (with displayed answers), differentiated tasks and quiz competitions to engage students whilst they assess their knowledge of the content that is found within topics P12 (Magnetism and the motor effect) and P13 (Electromagnetic induction) of the Edexcel GCSE Combined Science specification. Generally, these topics are poorly understood by students but are regularly assessed through questions in the GCSE exams and so time has been taken to design the lesson so that the key points are covered and common misconceptions addressed.
The following specification points are covered in this lesson:
- Recall that unlike magnetic poles attract and like magnetic poles repel
- Explain the difference between permanent and induced magnets
- Describe the use of plotting compasses to show the shape and direction of the field of a magnet and the Earth’s magnetic field
- Explain how the behaviour of a magnetic compass is related to evidence that the core of the Earth must be magnetic
- Explain that magnetic forces are due to interactions between magnetic fields
- Recall and use Fleming’s left-hand rule to represent the relative directions of the force, the current and the magnetic field for cases where they are mutually perpendicular
- Use the equation which connects force on a conductor, magnetic flux density, current and length
- Recall that a transformer can change the size of an alternating voltage
- Explain why, in the national grid, electrical energy is transferred at high voltages from power stations, and then transferred at lower voltages in each locality for domestic uses as it improves the efficiency by reducing heat loss in transmission lines
- Explain where and why step-up and step-down transformers are used in the transmission of electricity in the national grid
- Use the power equation (for transformers with 100% efficiency)
This lesson is suitable for use throughout the duration of the GCSE course, as an end of topic revision lesson or as a lesson in the lead up to mocks or the actual GCSE exams
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