Lesson Slides 2.2: Evaluating Energy Sources
Due Date
Tuesday, October 27, 2020 11:59pm
Resources
Harnessing Human Energy Glossary
Directions
Use the lesson slides as you work through each activity. These are where you will access all of the resources needed to complete this lesson guide.
Provide your responses in blue areas. Be sure to read and follow all of the directions.
Essential questions (orange) are questions we will keep trying to figure out through the lessons and will be able to answer at the end of the chapter or unit.
Key terms (blue) are important words or terms that you will become familiar with throughout the unit expected to know by the end. These can also be found in the glossary.

Activity 1
Reread the last two paragraphs of the “Energy Inventions” article below and highlight evidence that supports or goes against the claims:
Comparing Solutions

Using solar energy and capturing energy from humans are just some of the exciting ways people are using science to solve energy problems. There is no perfect solution, however. Solar energy relies on the sun and doesn’t work as well in the dark or on cloudy days. For example, if you were using your Little Sun to read at night and it ran out of energy, you would need to wait for the sun to come up so that more energy could be captured and transferred to the battery in your light. Just imagine if the next day was very cloudy! Your energy system would not be able to capture very much energy from the sun, so your light would not stay on for long.

The Little Sun lamp and the Hollow Flashlight have something in common: they get energy from somewhere else instead of making it themselves. In fact, that’s true of every object in the universe. Engineers must think about energy sources as they design their inventions. They must find an energy source that will do a good job of transferring energy to the object. The Little Sun lamp gets energy from the sun, while the Hollow Flashlight gets energy from the human body. There are many other possible energy sources to consider. For example, some devices transfer kinetic energy (energy of motion) from wind, water, or even people to power devices! There isn’t a single right way to provide energy when there’s no electrical grid available, and each source has its strengths and drawbacks. Which energy source would YOU choose?

Which claim do you think is most convincing based on the evidence you have gathered so far?

Activity 2
Ranking Energy Sources for the Rescue Team in the Doc.
Read each Energy Source Card carefully and discuss your questions and ideas about each energy source with your partner.
Next, arrange the cards in order of best to worst energy source options for the rescue team.
When you are finished sorting the cards, answer the question in your Doc.

Best Energy Source ↑

Worst Energy Source ↓

Which energy source did you rank as the best option for the rescue team? Why?

Activity 3
Complete the flashlight Energy Diagram by moving each image to match the form of energy it represents.

Potential Energy

Light Energy

Transfer- to move from one object to another or one place to another
Convert- to change from one type to another
Describe how energy moved through the system. Be sure to include your new vocabulary words where necessary.

Key Concept 4: Nothing creates energy. If something has energy, the energy must have been transferred from something else.
Key Concept 5: Energy can be transferred from one object to another, and energy can be converted from one type to another.

Activity 4- Homework
Complete each scenario by moving each image to match the form of energy it represents. Make sure to COPY (CTRL+C) and PASTE (CTRL+V). Describe how energy moved through the system in the box below the diagram. Be sure to include your new vocabulary words where necessary.

Scenario 1- Power a flashlight with a battery, using energy from the sun as the energy source
light energy

potential energy

light energy

Scenario 2- Power a flashlight with a battery, using energy from fuel (gasoline) as the energy source.
potential energy

potential energy

light energy
Scenario 3- Power a flashlight with a battery, using energy from food as the energy source.
potential energy

kinetic energy

potential energy

light energy

Go back and check that you have answered all questions (written in the blue areas). Then turn in your work on Google Classroom, by 11:59 PM on the day that it is due.