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Unit 4: Electricity for Everyone. 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?.
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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?
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
Day 1: Generate (60 minutes) • Learning Objectives • To understand how energy is transformed • Develop a personal model for electricity
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
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:
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 • Powerpoint • Poster • Poem/Story/Comic strip
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
Closing and Homework • Physics to Go, pg. 449 #2, 3, 4, 6
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
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
Activity 1 • Present your information that you researched about generators • Time: 15-30 minutes
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
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
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
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
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
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
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
Activity 2 • Graph the following data. What will be on the x- and y-axes? What does the slope represent? • Time: 20 minutes
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
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
Closing and Homework • Read the “For you to read” on pg. 459 • Physics to go, #1, 3, 4
