Energy efficiency of different light bulbs (There's a Thief in My Kitchen)

Students calculate the cost of the energy used to operate a common three-bulb light fixture. They then compare the costs and amount of CO2 produced for similar incandescent and compact fluorescent light bulbs. Students also do a short laboratory activity to visualize why two bulbs, which give off the same amount of light, use different amounts of electrical energy.

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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.