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Electrostatics

Electrostatics. Electrostatics. The branch of science dealing with static charges and their electric fields The Greek word for amber, ήλεκτρον electron, was the source of the word 'electricity'. Static Electricity. A little history.

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Electrostatics

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  1. Electrostatics

  2. Electrostatics • The branch of science dealing with static charges and their electric fields • The Greek word for amber, ήλεκτρον electron, was the source of the word 'electricity'

  3. Static Electricity

  4. A little history • The science of electricity has its roots in observation, known in 600 BC that a piece of amber rubbed with animal fur would attract straw, feathers • Thales of Miletos (Greece) in credited with this discovery

  5. What is amber? • Amber is the fossilized form of tree resin…not the same as sap. • Resin is similar to our scabs. It flows out of the tree to plug a hole.

  6. Benjamin Franklin • 1752 By tying a key onto a kite string during a storm, Ben Franklin , proved that static electricity and lightning were the same.

  7. The Leyden Jar • Progress quickened after the Leyden jar was invented in 1745 • The Leyden jar stored electricity and therefore could be studied at length

  8. The Battery • A new interest in current began with the invention of the battery. Luigi Galvani had noticed (1786) that a discharge of static electricity made a frog's leg jerk. • Galvani thought the leg supplied electricity, but Alessandro Volta thought otherwise. He showed that the metal plate and the Leyden jar were different metals and produced a current. He built the voltaic pile, an early type of battery, as proof.

  9. A quick review of the atom Every atom has a ______ charged nucleus surrounded by ____ charged electrons. positively negatively Electrons • _______ move in and out of fixed pathways around the nucleus

  10. Charges • Two kinds: positive and negative (terms coined by Benjamin Franklin) • Like charges ________ • Unlike charges ______ repel attract

  11. Objects that tend to give up electrons and become positive: • Glass • Nylon • Fur • Hair • Wool

  12. Be glad you are not a cat • http://www.youtube.com/watch?v=bcLDx_oiSMY

  13. Objects that tend to attract electrons and become negative: • Rubber • Styrofoam

  14. Let’s review #1 Balloon on wall

  15. Let’s review #2 Electroscope

  16. Let’s review #3 Water and balloon

  17. Let’s Review #5 2 balloons held near each other

  18. Bill Nye • http://www.youtube.com/watch?v=Z-77IzaXGcg

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