Grade 9 Science Unit 3: Electricity - St. Paul's ... show... · Grade 9 Science Unit 3: Electricity...
Transcript of Grade 9 Science Unit 3: Electricity - St. Paul's ... show... · Grade 9 Science Unit 3: Electricity...
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Grade 9 Science
Unit 3: Electricity
Chapter 7: Static electricity is produced by electron transfer.
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Static Electricity
•Refers to electric charges that can be collected and held in one place.
•It is the temporary transfer of electrons.
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Charges on objects…
Remember :
1. Protons have a positivecharge
2. Electrons have a negative charge
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•When the number of protons equals the number of electrons, the atom is neutral.
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•If electrons are removedfrom a neutral object, the object will become positively charged.•If electrons are added to a neutral object, the object will become negativelycharged.
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Activity 7-1B
Visualizing Charge Transfer
Pg. 231
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Sta
tic E
lectr
icit
y
Video.google.com(23 min)
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Electric Discharge
•The removal of electric charge from an object.
•Ex. Lightening
“shocks”
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Ele
ctr
ic
Dis
charg
e
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The Coulomb (C)
•The unit of electric charge.
•It takes the addition or removal of 6.25 x 1018
electrons to produce 1C of charge.
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Laws of Electric Charges:
1. Like charges repel
2. Unlike charges attract
3. Charged objects attract some neutral ones.
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Law
s of
Ele
ctr
ic
Charg
es
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Technologies and Static
Electricity
Lightening rods
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Photocopier
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Electrostatic air cleaner