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Electrostatics
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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'
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Static Electricity
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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
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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.
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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.
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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
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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.
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A quick review of the atom
positively negatively Electrons Every atom has a ______ charged nucleus surrounded by ____ charged electrons. _______ move in and out of fixed pathways around the nucleus
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Charges Two kinds: positive and negative (terms coined by Benjamin Franklin) Like charges ________ Unlike charges ______ repel attract
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Objects that tend to give up electrons and become positive:
Glass Nylon Fur Hair Wool
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Be glad you are not a cat
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Objects that tend to attract electrons and become negative:
Rubber Styrofoam
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Let’s review #1 Balloon on wall
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Let’s review #2 Electroscope
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Let’s review #3 Water and balloon
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Let’s Review #5 2 balloons held near each other
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Bill Nye
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