chapter 7: static electricity is produced by electron transfer unit 3: electricity
TRANSCRIPT
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CHAPTER 7: STATIC ELECTRICITY IS PRODUCED BY
ELECTRON TRANSFER
Unit 3: Electricity
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RECALL:
ATOM – the tiny particles which make up all matter
Read pages 228-230
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CHARGES ON OBJECTS
REMEMBER:
Protons (p+) have a Positive (+) charge
Electrons (e-) have a Negative (-) charge
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When the Number of Protons equals the Number of Electrons, the atom is NEUTRAL
NEUTRAL #p+ = #e-
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Neutral Atom
Equal Number of electrons outside the nucleus as Protons inside the nucleus
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POSITIVEPOSITIVE NEGATIVENEGATIVE
If electrons are REMOVED from a neutral object the object will become POSITIVELY charged
- removed +
If electrons are ADDED to the neutral object, the object will become NEGATIVELY charged
- added -
CHARGED OBJECTS
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They are located INSIDE the nucleus and have a far GREATER MASS then the electrons
which are located far from the nucleus and can therefore move between objects
PROTONS DO NOT MOVE!
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CHARGE TRANSFER
Electrons (e-) are transferred by friction when different materials are rubbed together, the one who has the strongest hold on the e- can take electrons from the other.
*Simulation
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= Stationary
refers to electric charges that can be collected and held in one place
Questions: page 231 #1-6
Static Electricity
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The removal of electric charge from an object
Example: lightening“shocks”
Simulation “John Travoltage”
Read page 233-234
ELECTRIC DISCHARGE:
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Questions page 234 #2,4-7
Technologies and Static Electricity
Lightening Rods
PhotocopiersElectrostatic
air cleaner
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The Coulomb (C):
The SI unit of electric chargeIt takes the ADDITION or REMOVAL of 6.25 x 1018 electrons to produce 1C of charge
Lab 7-1CQuestions page 237 #1,4,5,8,10-17,19
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1.LIKE CHARGES REPEL2.UNLIKE CHARGES ATTRACT3.CHARGED OBJECTS ATTRACT
SOME NEUTRAL OBJECTSRead
page239
LAWS OF ELECTRIC CHARGES:
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QUESTIONS PAGE 245 # 2,3,6,7,11
QUESTIONS PAGE 246 # 1-5, 7-9, 11,14-16,20,21,24,25
REVIEW QUESTIONS
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BLOOM BALL QUESTIONS
Section 1: Static Electricity
1.What is Static Electricity?2.What is a Coulomb?3.What is Electric Discharge?
Give 2 examples using illustrations.
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BLOOM BALL QUESTIONS
Section 2: Electrical Charge
1.Write down the 3 laws of electric charge.
Use images to represent these.2.Show how a neutral object can become
attracted to a charged object either negative or positive.
3.List 3 careers and/or technologies that involve electricity.