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# Electromagnetic Induction

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Electromagnetic Induction

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### Electromagnetic Induction

1. 1. Electromagnetic Induction <ul><li>If a magnet is moved into a coil of wire a current is induced in the wire. </li></ul><ul><li>If the magnet is moved out of the coil the direction of the current is reversed </li></ul><ul><li>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 </li></ul>Electromagnetic Induction
2. 2. Electromagnetic Induction Electromagnetic Induction
3. 3. Electromagnetic Induction Electromagnetic Induction
4. 4. Electromagnetic Induction Electromagnetic Induction
5. 5. Electromagnetic Induction Electromagnetic Induction
6. 6. Electromagnetic Induction Electromagnetic Induction
7. 7. Increasing the voltage <ul><li>The size of the induced voltage can be increased if; </li></ul><ul><li>the wire is moved faster </li></ul><ul><li>the magnet is stronger </li></ul><ul><li>the number of turns on the coil is increased </li></ul><ul><li>the area of the coil is greater </li></ul>Increasing the voltage
8. 8. Increasing the voltage Increasing the voltage
9. 9. Increasing the voltage Increasing the voltage
10. 10. Generators and Dynamos <ul><li>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 </li></ul>Generators and Dynamos
11. 11. Generating Electricity Generating Electricity
12. 12. Generator Generator
13. 13. Dynamo Dynamo
14. 14. Transformers <ul><li>Transformers can be used to change the voltage of an a.c. supply. </li></ul><ul><li>A changing magnetic field in the primary coil induces a voltage in the secondary coil </li></ul><ul><li>Transformers only work with alternating voltage </li></ul>Transformers
15. 15. Transformers Transformers
16. 16. Transformers <ul><li>Step-up transformers produce high voltages so that little energy is lost in power lines (National Grid) </li></ul><ul><li>Step-down transformers reduce voltages before the electricity reaches our homes </li></ul><ul><li>Primary voltage/Secondary voltage = Number of turns on primary/Number of turns on secondary </li></ul>Step-up & Step-down Transformers
17. 17. Transformers Step-up & Step-down Transformers
18. 18. Step up transformer Step up Transformer
19. 19. Step down transformer Step down Transformer
20. 20. Wordsearch Wordsearch
21. 21. Quiz Quiz