Explore Module
Engagement phase
Guiding question. Can we extract electricity from sunlight without moving parts?
The lesson opens with a brief demonstration: a small solar panel connected to an LED or a calculator. When exposed to light, the device works; when covered, it stops. The purpose is not simply to show that "solar panels work," but to introduce the idea that light energy can be directly converted into electrical energy through solid-state physics-no turbines, no combustion, no mechanical motion required.
Initial stimuli (videos and short resources)
How do solar panels work? TED-Ed: a clear animated overview of photovoltaic cells, the P-N junction, and electron flow.
Solar Energy Basics – U.S. Department of Energy: an accessible introduction to photovoltaic technology and renewable energy systems.
https://www.energy.gov/eere/solar/solar-photovoltaic-technology-basics
Photoelectric Effect: photoelectric Effect: interactive exploration of how photons interact with metal surfaces to eject electrons, demonstrating quantum properties of light.
https://phet.colorado.edu/en/simulations/photoelectric
A quick demonstration or video clip showing a solar cell powering a small motor or charging a battery invites students to ask, "How does light become electricity without wires moving or chemicals reacting?"
The goal is to highlight that energy conversion is a quantum process occurring at the atomic level within semiconductor materials, not a macroscopic mechanical or thermal transformation.
Suggested video: How Solar Panels Work (SciShow)