Calculate energy from power and time
Distinguish watts from watt-hours and convert to kilowatt-hours.
Open lesson 1Energy use over time and useful service
Integrate changing power records, account for outputs, and compare energy for a stated task.
Before you begin
- Multiply decimal quantities; convert Wh and kWh; calculate a percentage.
Choose by skill rather than age alone. Read with an adult when useful, revisit a lesson, or explore another grade.
Follow the lesson sequence
Add Energy across Power Intervals
Calculate total energy when power changes between stated intervals.
Open lesson 2Distinguish Useful Efficiency from Conservation
Compute an output fraction and complete an energy ledger.
Open lesson 3Choose an Energy Plan for a Defined Service
Compare plans that meet a requirement rather than only comparing watts.
Open lesson 4Review and transfer
After the lessons, try 4 new review cases and a practical task. Each answer has an explanation and a link back to the related lesson.
Open the unit reviewGuest answers are temporary. Keep your own paper or document; this unit does not certify completion or record a school grade.