Designing an Energy Device

Overview

Lesson 6 of 9 focuses on turning what students have learned about electrical circuits into a practical design. Students will brainstorm, choose a real-world problem, and draft a circuit-based device plan that includes the right components, a fair way to test it, and safe use of electrical parts.

Learning intentions

WALT design a simple electrical circuit device that solves a real-world problem. WALT explain how electricity can transfer energy through conductors and when insulators stop it. WALT plan a testable design by selecting variables to change, measure, and control. WALT create a clear representation of the circuit using accepted conventions (sketch labels).

Success criteria

• I can submit a design proposal with a clear sketch of the circuit and labelled components (including a power source and conducting pathway).
• I can explain how the circuit transfers and transforms energy to produce the device’s effect (e.g., light, sound, or indicator).
• I can identify what I would measure (e.g., brightness or “works/doesn’t”), what I would change, and what I would keep the same for a fair test.
• I can describe safe handling of the components and where insulators/conductors matter in my design.

Curriculum links

• Students design and construct appropriate electrical circuit representations and examine the purpose of components such as switches and bulbs.
• Students pose and refine investigable questions and make reasoned predictions about circuit function based on diagrams.
• Students plan repeatable investigations, deciding variables to change, measure, and control, and describing potential risks and safe equipment use.
• Students construct and use visual representations (tables/graphs/circuit diagrams or models) to organise and process information.

Lesson structure (45 minutes)

1. 0–5 min · Launch (link to Unit). Teacher shows 2 quick “problem scenario” cards (e.g., alert when a door opens; light sensor for a pathway) and asks students to think of one energy device that could help. Students share in a short whole-group round.
2. 5–12 min · Design brainstorm. Teacher prompts: “What problem will your device solve and what result will it produce?” Students complete a 3-box brainstorm: Problem → Device outcome → Energy effect (light/sound/warmth/movement/indicator).
3. 12–20 min · Choose components and make predictions. Teacher models using a simple circuit picture: power source, conducting wires, switch, and an output such as a bulb/buzzer/LED. Students select their required components and write a reasoned prediction: “If the switch is closed, then the output will… because the circuit is a complete path using conductors.”
4. 20–30 min · Sketch the circuit proposal (quiet + teacher conferencing). Teacher gives the design proposal sheet (includes a labelled sketch space and sentence prompts). Students draw their circuit using consistent symbols/labels, including where a switch is used and where an insulator might be used to prevent accidental contact. Teacher circulates and checks that each sketch is a complete circuit.
5. 30–38 min · Plan a fair test (mini investigation plan). Teacher asks: “How will you know it works?” Students fill in a simple fair-test checklist: Change (one variable), Measure (one outcome), Control (at least two things kept the same). Examples: keep battery type the same; keep wire lengths the same; change only switch position or conductor material.
6. 38–44 min · Share and refine (pair talk within group of 4). Teacher gives each student 1 minute to explain their design to a partner using the prompts: problem, circuit sketch, energy effect, and test plan. Partners give one “Glow/Question” comment (one strength and one question).
7. 44–45 min · Collection. Teacher collects design proposals and confirms safety reminder: no real mains power; handle batteries carefully; keep leads away from faces/eyes.

Resources

• Design proposal template (sketch space + labelled prompt boxes)
• Circuit component set per group (battery holder, wires, switch, LED/bulb, buzzer if available)
• Symbol/label reference cards for circuit components
• “Problem scenario” cards
• Safety reminder cards (battery handling, no mains, careful with leads)
• Coloured pencils for circuit sketching
• Student science notebooks

Assessment

• Teacher observation during sketching: checks for complete circuit, correct component inclusion, and clear labels.
• Conferencing notes: listens for reasoned predictions about circuit function and mentions of conductors/insulators.
• Design proposal review: evaluates success criteria using a quick rubric (sketch clarity, explanation, fair-test variables, safety statement).
• Optional quick teacher check: one oral question at collection: “What will you change and what will you measure?”

Differentiation

• Provide templates for students needing structure: sentence starters for problem/outcome/prediction, and a partially drawn circuit outline to finish.
• Offer a “component bank” checklist with tick boxes so students can confidently select required parts.
• For students needing extension: challenge them to add a second circuit “option” (e.g., use a switch arrangement to change the device’s behaviour) and update their fair test plan.
• Support language learners with word banks for: conductor, insulator, switch, measure, control, predict.
• Keep group work roles rotating (Designer, Explainer, Tester-planner, Safety checker) to ensure all students contribute.
• Provide additional scaffolds: picture prompts of common devices (alarm/light indicator) and a mini example circuit sketch for reference.

Extension (optional)

• N/A