Introduction

This activity introduces students to the concept of energy efficiency through a hands-on design challenge and real-world decision-making. Students begin with a simple physical demonstration to experience how smarter design can accomplish the same task with less effort. They then apply this idea to household appliances, using energy data and costs to explore how efficiency, comfort, and budget constraints interact. This activity emphasizes that energy efficiency is not just about using less energy, but about making thoughtful choices and trade-offs.

Student Objectives

Students will be able to

• Explain energy efficiency as accomplishing the same task using less energy. 
• Compare devices using annual energy use (kWh/year) to determine relative efficiency. 
• Identify more and less efficient household appliances. 
• Make decisions that balance energy use, cost, and comfort. 
• Describe why real-world energy choices often involve trade-offs rather than perfect solutions.

Materials

• Student Handout
• 2 sheets of paper (per student group)
• Stopwatch or timer (per student group)

Procedure

1. Engage: Paper Fan Test (Efficiency as Design) 
   • Divide students into groups of 2 or 3 and provide them with the Student Handout, two sheets of paper, and a stopwatch or timer. 
   • Introduce and discuss the idea that efficiency is about smarter design, not working harder.
   • Students will follow the instructions in the Student Handout and conduct the Paper Fan Test, constructing a more efficient paper fan by design (as opposed to just a flat piece of paper). 
   • Facilitate a whole-class discussion where student groups will show their designs and connect the folded paper fan to higher efficiency. 

2. Explain: Connecting the Model to the Real World
   • Guide students to the next part of the Student Handout, explaining that appliances can also be designed to do the same job while using different amounts of electricity (energy). 
   • Introduce the key rule students will use throughout the lesson: Lower kilowatt-hours (kWh) per year means higher efficiency.
   • Using the provided appliance table in the Student Handout, students will classify devices as more or less efficient based on their annual energy use. Emphasize that this step mirrors the flat versus folded paper comparison: same task, different energy required. 

3. Apply: Home Energy Design Challenge (Option A or B)
   Choose either Option A or Option B, depending on grade level and time. 
   • In Option A, students select exactly one appliance per category while staying under a set budget and annual energy limit. 
   • In Option B, students design a small home system with multiple choices, quantities, and cooling strategies, working with higher budget and energy constraints. 
   • For both options, students follow directions on the Student Handout to record choices, total energy use, costs, and reasoning.
   • Circulate to prompt discussion about trade-offs, especially when students must choose between lower cost and higher efficiency. 

4. Reflect: Making Sense of Trade-Offs
   • Conclude with reflection questions on the Student Handout that guide students to evaluate their decisions. 
   • Discuss which choices saved the most energy for the money, where students chose comfort or convenience over efficiency, and how changing electricity prices might affect their decisions. 
   • Emphasize that in real life, people rarely get everything they want at once. Energy decisions require balancing efficiency, cost, and needs.