Static Electricity

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Static Electricity
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ReviewWhat 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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Insulators and Conductors

• Insulators dont let electrons flow through them

• Conductors let electrons flow through them

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Charged Objects
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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
No smoke leaves the chimney
Positive Plate
Negative Plate
Charge up the Smoke
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Grounding Gas Tankers
Petrol rubbing against the pipe can build up a
static charge which could cause an explosion
The 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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