Energy Flow Models

Overview

Students investigate how energy transfers and transforms within a familiar system: a battery-powered flashlight. They build and revise an energy-flow model, then use evidence from a short technical text and data table to explain where energy goes. The lesson builds on prior learning about forms of energy and simple systems.

Learning intentions

Students will be able to:

• Develop a model showing energy transfers and transformations in a system.
• Use arrows, labels, and scientific vocabulary to represent energy flow.
• Cite specific evidence from a technical text and data table.
• Explain how changing one part of a system affects energy output.

Success criteria

• I can identify the energy input, transfers, transformations, and useful output in a flashlight system.
• I can create a model with accurately labeled arrows and forms of energy.
• I can cite a detail from the text or data table to support my explanation.
• I can revise my model when evidence shows it is incomplete or inaccurate.

Curriculum links

• Develop and use a model to explain energy transfer and transformation within a system.
• Cite specific textual evidence to support analysis of a science or technical text.
• Integrate quantitative information in a table with a visual model.
• Analyze an author’s purpose in explaining a scientific system and follow a multistep modeling procedure.

Lesson structure (40 minutes)

1. 0–5 min · Hook and prediction. Teacher displays a photo of a flashlight shining and asks, “Does all the chemical energy in the battery become light?” using the opening flashlight image and prediction question; students silently predict what happens to the energy, then share with a partner.

2. 5–11 min · Mini-lesson. Teacher uses the energy forms and system diagram slides to review chemical, electrical, light, and thermal energy, emphasizing that energy is transferred or transformed rather than destroyed. Students annotate a quick individual sketch of the battery, wires, bulb, light, and surrounding air.

3. 11–15 min · Read for evidence. Teacher distributes the flashlight evidence and modeling worksheet and directs students to read the short technical explanation, first independently and then with a partner. Students underline one sentence explaining an energy transformation and circle one detail describing energy that becomes thermal energy; dyslexia-friendly copies use a clear sans-serif font, generous spacing, and optional text-to-speech.

4. 15–27 min · Build the model. Teacher groups students into seven pairs and models the first step from the model-building directions: identify the system boundary and energy input. Students complete the worksheet model by adding labeled arrows from chemical energy in the battery to electrical energy, then to light and thermal energy; they cite the relevant sentence or table value beside each claim.

5. 27–34 min · Data-model integration and revision. Teacher reveals the efficiency data table and revision prompts and asks, “What does the data show about the energy output?” Students compare their models with the table, add or revise arrows, and write a two-sentence explanation using the frame: “The data show ____. This supports my model because ____.”

6. 34–38 min · Peer critique. Teacher displays the checklist on the peer-review slide and assigns each pair to exchange models with another pair. Students check for an input, at least two transfers or transformations, useful and less-useful outputs, arrows, labels, and cited evidence; each pair gives one specific suggestion.

7. 38–40 min · Exit ticket. Teacher displays the final prompt on the exit-ticket slide. Students independently answer: “Describe one energy transformation in the flashlight and cite one piece of evidence that supports your explanation.” Collect responses and models.

Resources

• the energy transfer and flashlight model deck
• the flashlight evidence and modeling worksheet
• Projector or interactive display
• Pencils, colored pencils, and highlighters
• Optional headphones and text-to-speech access
• Timer
• Exit-ticket slips or notebook paper

Assessment

• During the model-building task, check whether students distinguish energy forms from energy transfers and whether arrows show a sensible sequence.
• Review worksheet evidence citations and peer-feedback checklists; ask targeted questions such as, “Which detail proves that some energy becomes thermal energy?”
• Use the exit ticket to assess whether students can explain one transformation and support it with specific textual or quantitative evidence.

Differentiation

• Provide a partially completed model, a word bank, color-coded arrows, and sentence starters for students who need support: “Energy begins as ___,” “It is transferred to ___,” and “The evidence states ___.”
• Offer dyslexia-friendly copies with a clear sans-serif font, 14-point text, short paragraphs, increased line spacing, and text-to-speech or teacher read-aloud support. Allow students to explain their model orally before writing.
• Pair students strategically and assign roles such as reader, evidence finder, model builder, and checker; provide directions one step at a time and repeat them visually.
• For advanced learners, require a quantitative efficiency calculation using the table and ask them to redesign the flashlight system to increase useful light output while explaining the trade-offs in a revised model.