Light Source Efficiency: Exploring Irradiance

A white mobile with two arms. Hanging from the left arm is a solar powered paper plane. The solar panel is on the top and 2 propellors. On the right arm is a bird shaped paper plane with 3 solar panels down wing and on the back and 2 propellors.
Learning Goals

Learning Goals:

  1. Using a Vernier Pyranometer, students will measure electromagnetic radiation in watts per square meter (W/m2 ).
  2. Students will compare Sunlight irradiance with various indoor lighting options.
  3. Students will make a recommendation as to the optimum indoor lighting for powering solar panels.
Materials List

Handouts

Classroom Supplies

  • 1 LabQuest2
  • Vernier pyranometer
  • 2 Volt Solar panel
  • 2 Wire leads with clips
  • Various lights (fluorescent, halogen, incandescent, light-emitting diodes)
  • Light stand(s)

Optional: Group Supplies (2 per group)

  • LabQuest2
  • Vernier pyranometer
  • 2 Volt Solar panel
  • 2 Wire leads with clips
  • 1 Fluorescent light
  • 1 Halogen light
  • 1 Incandescent light
  • 1 LED light
  • 1 Light stand
  • Outdoor access for gathering Sun data

Important Links

Next Generation Science Standards

Next Generation Science Standards

Performance ExpectationHow is this Assessed?
MS-PS2-2 Plan an investigation to provide evidence that the change in an object’s motion depends on the sum of the forces on the object and the mass of the object.Students investigate the Center of Gravity using a meter stick and clay. Then they participate in an activity that works with irregular objects and finding the Center of Gravity leading up to finding the center of their irregular shaped aircraft that will be used on the solar mobile.
MS-ETS1-4 Develop a model to generate data for iterative testing and modification of a proposed object, tool or process such that an optimal design can be achievedStudents work through modifications and apply what was learned about solar circuits, the center of gravity, and irradiance as they build their final model.

Lesson 4 of 5 / Time: 1-2 periods of 55 mins

This lesson explores the concept of irradiance by having students use a Vernier Pyranometer. Using the “Light Source Efficiency” worksheet to guide their work, students measure irradiance as compared to the Sun’s irradiance to see what would be the best light source for powering their solar mobile indoors. This can be done as a demonstration or at a station if you only have one LabQuest2 and Pyranometer.

Solar Mobile Design Challenge

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