CHAPTER 7: STATIC ELECTRICITY IS PRODUCED BY

ELECTRON TRANSFER

Unit 3: Electricity

RECALL:

ATOM – the tiny particles which make up all matter

Read pages 228-230

CHARGES ON OBJECTS

REMEMBER:

Protons (p+) have a Positive (+) charge

Electrons (e-) have a Negative (-) charge

When the Number of Protons equals the Number of Electrons, the atom is NEUTRAL

NEUTRAL #p+ = #e-

Neutral Atom

Equal Number of electrons outside the nucleus as Protons inside the nucleus

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

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!

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

= Stationary

refers to electric charges that can be collected and held in one place

Questions: page 231 #1-6

Static Electricity

The removal of electric charge from an object

Example: lightening“shocks”

Simulation “John Travoltage”

Read page 233-234

ELECTRIC DISCHARGE:

Questions page 234 #2,4-7

Technologies and Static Electricity

Lightening Rods

PhotocopiersElectrostatic

air cleaner

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

1.LIKE CHARGES REPEL2.UNLIKE CHARGES ATTRACT3.CHARGED OBJECTS ATTRACT

SOME NEUTRAL OBJECTSRead

page239

LAWS OF ELECTRIC CHARGES:

QUESTIONS PAGE 245 # 2,3,6,7,11

QUESTIONS PAGE 246 # 1-5, 7-9, 11,14-16,20,21,24,25

REVIEW QUESTIONS

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.

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.