Pages 226-3451

Chapter 7: Static charge is produced by electron transfer

Pages 226-247 2

3.01 Explain the production of static charges in some common materials

• What causes static charges to build-up in objects?

• Name some common examples of static charges that you have seen at home.

3

3.01.1 Recognize that electricity is an integral part of our lives.

• Discuss how electricity influence our lives.• Discuss current electricity in the classroom

4

3.01.2 Define static electricity

Electric charges that can be collected and held in one place.

Stays until it jumps to a new object

5

3.01.3 Differentiate between static and current electricity using

operational definitions.Static Electricity• Build-up of electric

charges on an object

Current Electricity

• continuous flow of charges through a complete circuit

6

3.01.3 continued…

7

8

3.01.4 Describe the types of charges on objects. Positive

3.01.5 Describe how the charges on objects can change.

• Neutral objects can develop a positive charge if the object loses an electron.

9

3.01.5 continued…

• Neutral objects can develop a negative charge by gaining an electron.

10

3.01.5 continued…

• Positively charged objects can become neutral by gaining an electron

11

3.01.5 continued…

• Negatively charged objects can become neutral by losing an electron.

12

3.02 Explain the production of static electrical charges in some common

materials

Note: • Negative charges (electrons) move readily

whereas positive charges (protons) do not move.

• Demonstrate Van de Graff

13

3.02.1 Define electric discharge

• The removal of an electric charge from an object.

Examples: LightningRubbing feet across

carpetClothes from a dryer

14

3.02.2 Define 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.• Similar to the number of electrons that pass

into a 100 watt light bulb in one second.

15

Animations

• http://phet.colorado.edu/simulations/sims.php?sim=Balloons_and_Static_Electricity

• http://phet.colorado.edu/simulations/sims.php?sim=John_Travoltage

16

7-2 Electric Forces

Pages 238-247

17

3.03 Identify properties of static electrical charges

18

3.03.1 Define the Laws of Electric Charges

Three laws:1. Like charges repel2. Unlike charges attract3. Charged objects attract

neutral objects

19

3.03.1 continued…Charges Properties

Positive (+) Positive (+) Repel

Positive (+) Negative (-) Attract

Negative (-) Positive (+) Attract

Negative (-) Negative (-) Repel

Positive (+) Neutral Attract

Negative (-) Neutral Attract

20

21

3.04 Provide examples of how knowledge of static electricity has resulted in the

development of technologies

Lightning Rods

22

3.04.1 continued…• Photocopiers

3.04.1 continued…

• Electrostatic air cleaners

23

3.05 Provide examples of careers related to electricity

• Electrician• Engineers• Linesman• Photocopier technician• Others

24

25

Smartboard lessons

electrostaticsUS.notebook

StaticElectricitySenteoUS.notebook