Electrostatics. The branch of science dealing with static charges and their electric fields The...
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Transcript of Electrostatics. The branch of science dealing with static charges and their electric fields The...
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
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?
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
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
Progress quickened after the Leyden jar was invented in 1745
The Leyden jar stored electricity and therefore could be studied at length
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
Every atom has a ______ charged nucleus surrounded by ____ charged electrons.
positively
negatively
Electrons
_______ move in and out of fixed pathways around the nucleus
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:
GlassNylonFurHairWool
Be glad you are not a cat
http://www.youtube.com/watch?v=bcLDx_oiSMY
Objects that tend to attract electrons and become negative:
• Rubber• Styrofoam
Let’s review
#1Balloon on wall
Let’s review
#2Electroscope
Let’s review
#3Water and balloon
Let’s Review
#5 2 balloons held near each other
Bill Nye
http://www.youtube.com/watch?v=Z-77IzaXGcg