Electrostatics
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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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Electrostatics

Electrostatics


Electrostatics1

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

Static Electricity


A little history

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


What is amber

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.


Benjamin franklin

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.


The leyden jar

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


The battery

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.


A quick review of the atom

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


Charges

Charges

  • Two kinds: positive and negative (terms coined by Benjamin Franklin)

  • Like charges ________

  • Unlike charges ______

repel

attract


Objects that tend to give up electrons and become positive

Objects that tend to give up electrons and become positive:

  • Glass

  • Nylon

  • Fur

  • Hair

  • Wool


Be glad you are not a cat

Be glad you are not a cat

  • http://www.youtube.com/watch?v=bcLDx_oiSMY


Electrostatics

Objects that tend to attract electrons and become negative:

  • Rubber

  • Styrofoam


Let s review

Let’s review

#1

Balloon on wall


Let s review1

Let’s review

#2

Electroscope


Let s review2

Let’s review

#3

Water and balloon


Let s review3

Let’s Review

#5 2 balloons held near each other


Bill nye

Bill Nye

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


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