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Electrostatics

Electrostatics. Chapter 21-1. Electric Charge. Explain the atom and the charges on an atom Neutrons Protons electrons. Transferring Charge. Why is an atom electrically neutral? How can it become charged negatively? How can it become charged positively? What does static mean?

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Electrostatics

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Presentation Transcript

  1. Electrostatics Chapter 21-1

  2. Electric Charge • Explain the atom and the charges on an atom • Neutrons • Protons • electrons

  3. Transferring Charge • Why is an atom electrically neutral? • How can it become charged negatively? • How can it become charged positively? • What does static mean? • What is static electricity?

  4. Conservation of Charge • Charge can be transferred from one object to another, but it cannot be destroyed

  5. Law of Electrostatics • What charges attract? • What charges repel? • Opposite charges attract and like charges repel

  6. Electric Field • The area around a charged object • The area has the same charge at the charged object • Strongest nearest the electrons

  7. Comparing Electric & Gravitational Forces • Which is larger? • A thousand trillion trillion trillion times larger (1036)

  8. Conductors • A material that allows electrons to move easily through it • won’t retain a charge • Silver is the best, copper, metals

  9. Insulators • A material that won’t allow electrons to pass through easily • Wood, plastics, glass, water, air

  10. Charging by Conduction • Charging by contact • Touch the uncharged object with the charged object • Resulting charge is the same as the charging object • Transfer of electrons

  11. Charging by Induction • Charging at a distance • The charging object and the uncharged object don’t touch • The resulting charge is the opposite • A temporary charge

  12. Paper Snips

  13. Lightning • Explain how lightning forms • Where is it safe to be in a lightning storm? • Safe position if caught far from shelter

  14. Thunder • Lightning produces both light and sound waves • Lightning produces great amounts of heat • Air temperature rises to 30,000oC • Causing air to expand rapidly producing the sound waves.

  15. Grounding • The process of neutralizing a charged object • Earth is a good ground because it is a good source or sink of electrons

  16. The Electroscope • A device that detects a charge

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