1. Chapter 8 Ohm’s law describes the relationship of current, voltage and resistance Pages 248-283 1

2. 8-1 Electric Potential Energy and Voltage Pages 250-259 2

3. 3.06.1 Use an ammeter and a voltmeter to measure current and voltage in a circuit Ammeter A device used to measure current. Voltmeter A device used to measure the potential difference 3

4. 3.06.2 Identify the volt (V) as the SI unit for electric potential Unit used to measure electric potential energy is the volt (V). Named after Alessandro Volta Measured by using a device called voltmeter 4

5. 3.06.1 Define electric potential difference The amount of electric potential energy per one coulomb of charge The change in potential energy per coulomb of charge Measured in volts (V) Also known as voltage 5

6. Section 8.2 Electric Current Pages 260-269 6

7. 3.07 Describe the flow of charge in an electric circuit 7

8. 3.07.1 Define electric circuit A complete pathway that allows electrons to flow 8

9. 3.07.2 Identify that electric potential is provided as the source and is “used” by the circuit elements 9

10. 3.07.3 Describe the parts of an electric circuit. I.Source of electrical energy II.Electrical load III.Controls/switch IV.Conductor 10

11. 3.08 Explain the importance of using precise language while studying the characteristics of electricity 11

12. 3.08.1 Define electric current Electric Current  The amount of charge passing a given point in a conductor per second.  Measured in amperes (A)  Measured using 1. ammeter…strong current 2.galvanometer…weak current 12

13. 3.08.2 Identify the ampere (A) as the SI unit for current Unit used to measure current … ampere Measured using Ammeter…strong current Galvanometer…weak current Name after Andre Marie Ampere Named after Luigi Galvani Ampere 13

14. 3.09 Compare static electricity and current electricity Current Electricity  The continuous flow of charge in a complete circuit. Static Electricty Build-up of electric charges in an object. Jumps from one object to another 14

15. 3.10 Organize information using a format appropriate to studying and describing current electricity Circuit Diagrams See symbols on page 262. 15

16. 3.10.1 Create circuit diagrams using appropriate circuit symbols I.Bulb II.Cell III.Battery IV.Wires V.Resistors VI.Ammeter VII.Voltmeter VIII.Open switch IX.Closed switch 16

17. 3.10.1 continued… Draw and interpret electric circuit diagrams using electric symbols Activity - Page 263 17

18. 8.3 Resistance and Ohm’s Law Pages 270-283 18

19. 3.10.2 Define electrical resistance Electrical Resistance  Slows down the flow of electrons. (resistors)  Transforms electrical energy into light, heat, etc.  The ratio of the voltage to the current.  R = V I 19

20. 3.10.3 Identify the ohm (Ω) as the SI unit for electrical resistance Electrical resistance is measured in ohm’s (Ω) Measured using ohmmeter Named after George Simon Ohm 20

21. 3.10.4 List factors which affect the amount of resistance in a wire I.Length II.Diameter III.Type IV.Temperature 21

22. Ohm’s Law…animation http://www.physicslessons.com/phe/ohmslaw.htm http://www.physicslessons.com/phe/ohmslaw.htm http://www.physicslessons.com/exp41.htm 22

23. 3.11 State a prediction and a hypothesis based on background information or an observed pattern of events Activity 8-3 B pages 275 23

24. 3.12 Identify new questions and problems that arise from what was learned concerning voltage, current, and resistance Activity 8-3 B pages 275 24

25. 3.12.1 State Ohm’s Law Ohm’s Law The mathematical relationship between voltage (V), current (I) and resistance (R) 25

26. 3.12.2 Given voltage drop and current through a resistor, calculate its resistance Complete the practice problems Pages 273-275 26

27. 3.12.3 Given voltage drop and resistance, calculate current through a resistor Complete the practice problems Pages 273-275 27

28. 3.12.4 Given current through a resistor and its resistance, calculate the voltage drop Complete the practice problems Pages 273-275 28

29. Video…Ohms Law http://www.youtube.com/watch?v=JRp_iSaVR jE&feature=related http://www.youtube.com/watch?v=JRp_iSaVR jE&feature=related http://www.youtube.com/watch?v=_- jX3dezzMg http://www.youtube.com/watch?v=_- jX3dezzMg http://www.youtube.com/watch?v=8utldTdAJ mk&feature=related http://www.youtube.com/watch?v=8utldTdAJ mk&feature=related 29

30. 3.13 Identify potential sources of error in ammeter and voltmeter readings Activity 8-3D Pages 278-279 30

31. 3.14 Identify and suggest explanations for discrepancies in data collected using an ammeter and voltmeter Activity 8-3D Pages 278-279 31

32. 3.15 Present graphically, using the line of best fit, data from investigation of voltage, current, and resistance Activity 8-3D Pages 278-279 32