1. Unit 4: Electricity for Everyone

2. Essential Questions What is electricity and how is it measured? How do generators work? How is energy converted from one form to another? What are parallel and series circuits? What is a load limit, and how is it calculated? What does electricity cost?

3. Chapter Challenge For this unit’s chapter challenge, you will be using the scenario on page 444-445 This is what your final exam will be in December A rubric will be given to you beforehand, so you know the criteria you will be assessed on You may prepare for the chapter challenge, but you can not bring any of your written work to the exam, only your textbook and rubric

4. Day 1: Generate (60 minutes) Learning Objectives To understand how energy is transformed Develop a personal model for electricity

5. Starter What are different ways that you use electricity in your daily life? Is there any “free” electricity available? Why pay for it if it is free? Time: 10 minutes

6. Activity 1 Watch the following video and think of the following: How would the light bulb not light? What are the effects of changing the speed or direction of cranking the generator? Time:

8. Activity 2 You will be given a number which represents the group you are in You will research with your group and present what you find in a particular way 1.Powerpoint 2.Poster 3.Poem/Story/Comic strip

9. What to research? What is a generator? How does it work? What are the different types of generators? How is energy transformed using a generator? Time: 40 minutes Presentations – next class

10. Closing and Homework Physics to Go, pg. 449 #2, 3, 4, 6

11. Day 2: Lighten Up Learning Objectives: Qualitatively describe current, resistance and voltage Define coulomb, ampere, volt Compare series and parallel circuits Recognize generator output load Extend your personal model of electricity

12. Starter Lights were the first electric appliances for the home How do light bulbs work? How does the electricity that makes the light bulbs glow work? Time: 15 minutes

13. Activity 1 Present your information that you researched about generators Time: 15-30 minutes

14. Activity 2 Draw 2 diagrams of a circuit, one in series and one in parallel. They should have 3 light bulbs Battery What are the pros and cons of each type of circuit? Time: 10 minutes

15. Activity 3 Set up your circuits, one at a time Measure the voltage using the voltmeter to see if there are any differences in voltage in the two different circuits Check the voltage at various points in the circuit Write down your findings Time: 30 minutes

16. Activity 4 Discuss the following questions: What is resistance, current, and voltage? Where is there more current and voltage – in a series circuit or parallel circuit? Will electricity continue to flow if the circuit is broken in a parallel circuit? A series circuit? Why or why not? Use a diagram to help explain. Time: 20 minutes

17. Closing and Homework Read “For you to Read”, pg. 452 Physics to go, pg. 454 #1 What is resistance, current, and voltage? Where is there more current and voltage – in a series circuit or parallel circuit? Will electricity continue to flow if the circuit is broken in a parallel circuit? A series circuit? Why or why not? Use a diagram to help explain. Vocabulary list: Volt Ampere Coulomb Resistance Current

18. Day 3: Ohm’s Law Learning Objectives Calculate the resistance of an unknown resistor given the potential drop and current Construct a series circuit Properly use a voltmeter and ammeter in a series circuit Graph the relationship between voltage and current for a resistor that obeys Ohm’s La

19. Starter What determines the brightness of a light bulb? How can a dimmer switch make the same light bulb appear dim or bright? What is resistance, current, and voltage? Where is there more current and voltage – in a series circuit or parallel circuit? Will electricity continue to flow if the circuit is broken in a parallel circuit? A series circuit? Why or why not? Use a diagram to help explain. Time: 15 minutes

20. Activity 1 Read through rules on pg. 456-457 Connect various resistors from the box to the battery source Measure the voltage and current for the different resistors What happens if you have more than 1 resistor? Record your data Time: 30 minutes

21. Activity 2 Graph the following data. What will be on the x- and y-axes? What does the slope represent? Time: 20 minutes Resistor value ( Ω ) Voltage (V)Current (A) 31.50.5 331 34.5 101.5 103 4.5 151.5 153 4.5

22. Activity 3 What is the relationship between resistance, voltage and current? Try to write an equation that represents the relationship Think: how do you calculate slope? Time: 5 minutes

23. Activity 4 Ohm’s Law Calculations: Example: Calculate the resistance in Ohms of a 9V battery that carries a current of 3A. Complete the calculations questions Time: 20 minutes

24. Closing and Homework Read the “For you to read” on pg. 459 Physics to go, #1, 3, 4

25. Day 4: Load Limit

26. Day 5: Who’s in Control (60 minutes)

27. Day 6: Cold Shower

28. Day 7: Pay Up

29. Day 8: More for Your Money