Encourage students to become savvy energy consumers with this computation and bar graph activity.
Skills supporting learning standards: reading comprehension; interpreting illustrations, charts, or graphs; problem-solving; computation
1. Begin this lesson by asking students if they have ever seen an electric bill and if they know how much it costs to power a home each month.
2. Distribute the activity sheet and review the information with your students. Have students work independently to complete the page and then review the answers as a class.
3. As a follow-up, ask students to brainstorm ways they could reduce their energy use.
- Kilowatt hour (kWh)
- One kilowatt hour is the amount of electricity it takes to light a 100-watt bulb for 10 hours.
- $109.24/482 kWh ≈ $0.23/kWh
- July—approximately 24 kWh daily. $0.23 x 24 kWh = $5.52; $5.52 x 31 = $171.12
- May—approximately 13 kWh daily. $0.23 x 13 kWh = $2.99; $2.99 x 31 = $92.69
- The increase in usage might have been due to using an air conditioner. Perhaps in May this person didn't need to use a lot of electricity, as the springtime weather is not too hot and not too cold.