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physics investigatory on Electromagnetic induction

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physics investigatory on Electromagnetic induction

  1. 1. 1. If a magnet is moved into a coil of wire a current is induced in the wire. 2. If the magnet is moved out of the coil the direction of the current is reversed 3. A wire, or coil of wire, cutting through a magnetic field will generate a voltage. This induced voltage causes a current to flow through the wire Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
  2. 2. Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
  3. 3. Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
  4. 4. Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
  5. 5. Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
  6. 6. Electromagnetic InductionElectromagnetic InductionElectromagnetic InductionElectromagnetic Induction
  7. 7. The size of the induced voltage can be increased if; • the wire is moved faster • the magnet is stronger • the number of turns on the coil is increased • the area of the coil is greater Increasing the voltageIncreasing the voltageIncreasing the voltageIncreasing the voltage
  8. 8. Increasing the voltageIncreasing the voltageIncreasing the voltageIncreasing the voltage
  9. 9. Increasing the voltageIncreasing the voltageIncreasing the voltageIncreasing the voltage
  10. 10. 1. Electricity is generated by rotating a coil of wire in a magnetic field or by rotating a magnet inside a coil of wire. This is how a generator works Generators and DynamosGenerators and DynamosGenerators and DynamosGenerators and Dynamos
  11. 11. Generating ElectricityGenerating ElectricityGenerating ElectricityGenerating Electricity
  12. 12. GeneratorGeneratorGeneratorGenerator
  13. 13. DynamoDynamoDynamoDynamo
  14. 14. 1. Transformers can be used to change the voltage of an a.c. supply. 2. A changing magnetic field in the primary coil induces a voltage in the secondary coil 3. Transformers only work with alternating voltage TransformersTransformersTransformersTransformers
  15. 15. TransformersTransformersTransformersTransformers
  16. 16. 1. Step-up transformers produce high voltages so that little energy is lost in power lines (National Grid) 2. Step-down transformers reduce voltages before the electricity reaches our homes 3. Primary voltage/Secondary voltage = Number of turns on primary/Number of turns on secondary Step-up & Step-down TransformersStep-up & Step-down TransformersStep-up & Step-down TransformersStep-up & Step-down Transformers
  17. 17. Step-up & Step-down TransformersStep-up & Step-down TransformersStep-up & Step-down TransformersStep-up & Step-down Transformers
  18. 18. Step up TransformerStep up TransformerStep up TransformerStep up Transformer
  19. 19. Step down TransformerStep down TransformerStep down TransformerStep down Transformer
  20. 20. WordsearchWordsearchWordsearchWordsearch
  21. 21. QuizQuizQuizQuiz

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