Reflection: Modeling Electric Energy: Evaluating the Cost - Section 3: Watts In a Lightbulb Activity


Sometimes I learn an easier way to do things from my students. While asking students to present their Solution to the problem, there was a group that brought up more elegant solution than mine. I found it to be more simple and understandable and I congratulated them on finding such a path to the final answer.

In my solution to find the cost savings of using the LED over the incandescent, I first figured out how much both bulbs cost to operate for a year when used for 2 hours a day. Then I determined how many years the LED would last given its 20,000 hour life span and multiplied that by the cost savings per year to get a total of $180.  The Students Elegant Solution was to simply apply the cost formula to both bulbs for 20,000 hours (the life of the LED) and see how much money was saved, which is also $180. I let them and the whole class know that I preferred that student group's solution over mine and that in the future I will use theirs.

  Modeling: Multiple Paths to the Same Answer
Loading resource...

Electric Energy: Evaluating the Cost

Unit 4: Electrostatics and Circuits
Lesson 15 of 16

Objective: Given the local generation service charge for electricity, students evaluate the cost of operating various appliances.

Big Idea: When evaluating the cost of an electronic device, the cost of operation, as well as the upfront cost are important to consider.

  Print Lesson
2 teachers like this lesson
Similar Lessons
Using Student Carbon Footprint Data to Connect to the Climate Change Debate (Day 1 of 2)
High School Biology » Unit 3: Basic Chemistry in Biology
Big Idea: Use a carbon footprint calculator and an online discussion forum to get your kids talking about climate change and how they can help!
Walnut Creek, CA
Environment: Suburban
Maria Laws
Enhancing Our Model of Work
High School Physics » Electrostatics
Big Idea: Estimations are important, necessary, and can be improved.
Woodstock, VT
Environment: Rural
Timothy Brennan
Ensuring Lab Safety
High School Biology » Biology Essentials - Starting Your Year Off Right!
Big Idea: Lab safety is the cornerstone of an effective lab-science classroom. This lesson will review proper lab safety procedures, identify available safety equipment in your classroom, and review the Lab Safety Contract.
Thousand Oaks, CA
Environment: Suburban
Ashley Cooper
Something went wrong. See details for more info
Nothing to upload