There's a Thief in My Kitchen (energy efficiency of different lightbulbs)

In this activity, students calculate the cost of the energy used to operate a common three-bulb light fixture, and compare the costs and amount of CO2 produced for similar incandescent and compact fluorescent light bulbs.

Go To:

Connecticut Energy Education

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Teaching Tips

Teaching Tips

Educators should add short answer questions for a final assessment.

An interesting graphic that summarizes energy usage can be found at

For best results, place the light bulbs close to the thermometers (10 - 20 cm).

Educators should stress that the personal change in energy has to go beyond changing light bulbs, but it is a good start.

Educators may want to include LED bulbs in the investigation part of the activity.