unit 4: electricity for everyone
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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?
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
1. Powerpoint2. Poster3. 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
Resistor value (Ω)
Voltage (V) Current (A)
3 1.5 0.53 3 13 4.510 1.510 310 4.515 1.515 315 4.5
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
Day 4: Load Limit
Day 5: Who’s in Control (60 minutes)
Day 6: Cold Shower
Day 7: Pay Up
Day 8: More for Your Money
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