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Moving & Using Static Charge

Moving & Using Static Charge. Text 10.1-10.2: Page 400-411. Agenda. Review of Static Charge Moving Charge Different Materials Contact Charge Induction Charge Grounding Electric Discharge Electroscope Review Activity. Learning Goals. By the end of this class, we should be able to

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Moving & Using Static Charge

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  1. Moving & Using Static Charge Text 10.1-10.2: Page 400-411

  2. Agenda • Review of Static Charge • Moving Charge • Different Materials • Contact Charge • Induction Charge • Grounding • Electric Discharge • Electroscope Review Activity

  3. Learning Goals • By the end of this class, we should be able to • Compare and contrast insulators and conductors • Compare and contrast static, contact and induction charge • Complete an investigation to test types of current charge and conductivity of materials

  4. Reviewing Static Electricity

  5. Materials • Materials can be grouped by weather they allow charge to move through them • Insulators and Conductors are groupings determined by their conductivity • Conductivity is the ability of materials to allow Martials to allow electrons to move freely in them.

  6. Insulators • Material that hold onto their electrons and do not allow them to move easily are called electrical insulators • An insulator is a solid, liquid or gas that resists or blocks the movement of electrons • EX: dry wood, glass and plastic

  7. Conductors • Materials that allow electrons to change positions are called conductors • Conduction is the movement or transmission of electrons through a substance • Ex. Copper and aluminum

  8. Somewhere in the Middle? • Some materials only allow some movement of electrons • These are called fair conductors • Sort of like an insulator, sort of like a conductor • NOTE: only PURE water is an insulator • Most water has minerals in it so it is considered a fair conductor

  9. Let’s Test It – Conductivity Test • Assemble the electrical conductivity apparatus. • Test conductivity of different samples.

  10. How Can You Test For Charge? • You can use an electroscope • This is an instrument used to detect electric charge • Metal-Leaf electroscope has a two very thin metal pieces called leaves suspended from a metal rod. • The metal rod is then attached to a top plate or metal knob

  11. What Would Happen If? +

  12. What Would Happen If? -

  13. Contact Charge • This is an example of Contact Charge • This can also be called charge by contact • The charge is made through contact with another charged object

  14. Induction Charge • This is very similar to contact charge • Is the movement of electrons between objects close by but not in direct contact • EX: you can statically – charge a balloon by rubbing it on your hair • Put the balloon near a wall and it will attract to it! • No contact is made

  15. Grounding • Grounding is the process of connecting a charged object to the earth’s surface • This creates a path for the electrons to travel to the ground • “Escape route” for electrons which removes charge

  16. Electric Discharge • When electrons find an escape route and they transfer very quickly it is called electric discharge • Sparks are an example • Sparks are a transfer of charge by induction

  17. Electric Discharge • Lightning is a very large example or electric discharge • Inquiry Question – Which way does a lightning bolt travel? http://www.youtube.com/watch?v=l9kVA6aY5P8

  18. Electroscope Lab

  19. Using Static Charge • Pick a group of 2-3(max.) • Choose a topic: • Lightning rods (p.g. 418) • Static charge on vehicles (p.g. 419) • Reducing static charge at home & work (p.g. 420) • Spray Painting (p.g. 421) • Photocopying (p.g. 422) • Enviromental Applications (p.g. 423) • Summarize your findings using words & text • Final Round = Static Charge Walk About

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