1. Extension Activities:
Which Lightbulb is Better? Linear Models of Heat and Cost Efficiency
Algebra 1
Duration: 90 min
Standards: HSA.CED.A.1
HSA.CED.A.2
HSA.CED.F-IF.4
HSA.CED.F-IF.6
Overview: Students will collect data (temperature, wattage) to determine energy and cost efficiency of different lightbulbs. They will create and graph linear equations to display, analyze and determine results.
Materials:
3 lightbulbs (halogen, fluorescent, led)
Data Collection Worksheet
Graphing calculator (TI-84)
Pencils/Pens
Graphing Paper
Multi-meter
Lamp
Extension Activities:
Analyze Efficiencies of Different Appliances
Model scenarios for different energy uses on weekdays/weekends

2. Procedure: Teacher Tips:
Students review graphing linear equations and are asked the question “Which lightbulb is better?”
Students collect data on wattage and heat emissions from lightbulbs.
Students create equations and graphs for heat efficiency and cost efficiency of lightbulbs.
Teacher Tips:
Collaborate with science teachers
Run through the lesson beforehand especially if unfamiliar with the equipment.
Have stations already set up for students so they don’t have additional procedures.