static electricity. review: what is inside the atom? the atom is made of 3 kinds of particles. the...
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Static Electricity
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Review:What is inside the atom?
The atom is made of 3 kinds of particles.
The electron
The proton
The neutron
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The Atom
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Charges
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Charges
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Insulators and Conductors
Insulators don’t let electrons flow through them
Conductors let electrons flow through them
Electrons stay stuck on the surface and don’t move—That’s STATIC ELECTRICITY!
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Charged Objects
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Neutral Object
Negatively Charged Object
Positively Charged Object
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How Do They Become Charged?
Contact
Electrons get
passed from one
object to the other
when they touch
Induction
Electrons in the
object move away
or towards another
charged object is
placed close to it
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Friction
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What happens when you rub a balloon on your head and put it against the wall?
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http://phet.colorado.edu/sims/balloons/balloons_en.jnlp
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Uses of Static Electricity
Spraying a Car Positive Car
Negative Spraygun
The paint spreads out as each negative drop repels
No paint is wasted as the positive car attracts the negative paint
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Removing Smoke from Power Station Chimnies
Positive Plate
Negative Plate
Charge up the Smoke
No smoke leaves the chimney
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Earthing Petrol Tankers
Petrol rubbing against the pipe can build up a static charge which could cause an explosionThe tanker is joined to the ground with a wire to stop a charge building up
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Lightning
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What causes lightning?
Lightning is actually just static electricity on a much larger scale.
The rubbing is caused by air moving around
In thunderclouds bottom is usually negative and top is positive.
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References
A Dercho Investigating Science 9 -Pearson