Circuit Design Challenge

Name:

Team:

Date:

Design goal:

Part 1: Plan Safely and Use Circuit Words

Challenge: Design a small useful device, such as an emergency lantern, farm-lighting system, solar-powered device, or off-grid model. Your device must use a complete circuit.

Safety reminder: Use only low-voltage batteries. Keep liquids away. Check wires before connecting. Never use a wall outlet. Do not connect a battery directly to another battery or directly from one battery terminal to the other.

1. Match each word to its meaning. Write the letter in the matching space.

____ circuit

____ conductor

____ insulator

____ switch

____ open circuit

____ closed circuit

A. A material that does not let electricity move easily

B. A complete path that allows electricity to move

C. A device that opens or closes a path

D. A material that lets electricity move easily

E. A broken path; the device will not work

F. A complete path; the device can work

2. Sketch and label your circuit. Include a battery, wires, a switch, and a load such as a bulb, LED, buzzer, or motor. Show the path of electricity.

3. Materials checklist: Check the materials your team plans to use.

Battery and holder

Insulated wires

Switch

Bulb, LED, buzzer, or motor

Conductive test material

Insulating test material

4. Prediction: What will happen when you close the switch? Why?

Sentence starter: “I predict the device will __________ because __________.”

Word bank: battery, energy, path, current, load, conductor, insulator, open, closed, bright, dim, series, parallel, renewable, evidence

Success criteria: I can draw a complete circuit, label its parts, follow safety rules, and make a prediction using science words.

Part 2: Build, Test, Improve, and Explain

Team roles: builder, materials manager, recorder, and reporter. Follow the procedure in order: build, check safely, test, record, troubleshoot, improve, and retest.

5. Record at least four trials. Use words or numbers for your brightness or success rating: 1 = no success, 2 = weak, 3 = good, 4 = strong.

Trial 1: Switch position: __________ Bulb/LED result: __________ Rating: ____

Observation or evidence: ____________________________________________________________

Trial 2: Switch position: __________ Bulb/LED result: __________ Rating: ____

Observation or evidence: ____________________________________________________________

Trial 3: Switch position: __________ Bulb/LED result: __________ Rating: ____

Observation or evidence: ____________________________________________________________

Trial 4: Switch position: __________ Bulb/LED result: __________ Rating: ____

Observation or evidence: ____________________________________________________________

6. Troubleshooting interview: Before asking for help, check all that may explain the problem.

There may be a break in the circuit.

A wire may be loose or not touching metal.

The LED may be reversed.

A battery, wire, switch, or load may be missing.

Our most likely problem was ____________________. We checked it by ____________________.

7. Improve and retest: What one purposeful change did your team make? What evidence shows whether it helped?

Sentence starter: “We changed __________. The rating changed from ____ to ____ because __________.”

8. Reflection: Was your prediction supported by your test results? Use at least two observations as evidence.

9. Which energy option would best fit your design: local hydroelectricity, solar power, or a generator? Give one benefit and one limitation.

Success criteria: I can build and troubleshoot safely, record four trials, use evidence to improve my design, and explain my energy choice.

Supports: Use color-coded wires, physical circuit parts, labeled diagrams, partner talk, gestures, or an oral explanation before writing. Ask a partner: “What changed?” and “What evidence do you see?”

Optional challenge: Compare series and parallel circuits, measure operating time or brightness, or recommend an energy system for a remote farm. Include the energy demand, one safety concern, and evidence for your recommendation.

Science reading and recording connection: Follow the steps in order and explain cause and effect (CCSS.ELA-LITERACY.RST.6-8.3). Use your labeled diagram and test records as technical information (CCSS.ELA-LITERACY.RST.6-8.7).

Teacher Answer Key—Final Page

1. Vocabulary: circuit—B; conductor—D; insulator—A; switch—C; open circuit—E; closed circuit—F.

2. Circuit sketch: Accept any clearly labeled complete circuit showing a battery or other power source, a conducting path, a switch, and a load. Wires should connect the parts in one continuous path. Series or parallel designs may be accepted when appropriate.

3. Materials: Answers depend on the planned design. Safe choices include a low-voltage battery, insulated wires, switch, load, and approved test materials.

4. Prediction: Look for the idea that closing the switch completes the path, allowing electrical energy to transfer to the load. Example: “The LED will light because the closed circuit gives current a complete path.”

5. Testing: Students should record four trials with switch position, bulb or LED result, rating, and observations. Accept varied results when they are recorded honestly and explained with evidence.

6. Troubleshooting: Appropriate checks include a broken path, loose connection, reversed LED, dead or disconnected battery, missing component, or incorrect switch position. Students should identify a check and explain what they found.

7–9. Improvement and reflection: Strong responses name a specific change, compare evidence from before and after, and explain whether the prediction was supported. Energy choices should include a reasonable benefit and limitation. Solar and hydroelectric power are renewable; generators commonly use limited fuels but can provide power when sunlight or grid power is unavailable.

Assessment look-fors: complete and labeled circuit; safe low-voltage equipment use; accurate vocabulary; organized trial records; evidence-based troubleshooting; purposeful improvement; and a clear energy recommendation.