Check and revise the final energy comparison
See this course’s project requirements
A desk-based household energy comparison with checked kWh estimates, usage assumptions and a safe no-installation conservation recommendation.
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What to include
- Calculate power-time energy with explicit units.
- Complete a quantity-aware 30-day device table.
- Separate ratings, measurements and standardized estimates.
- Compare matched lighting output and calculate differences.
- Recommend an existing-control action preserving essential services.
- Recalculate the final comparison and retain evidence limits.
Review and revise
Use these criteria to check your work and choose what to improve.
- Method: applies the course-specific rules to the supplied cases with visible intermediate work.
- Accuracy: results agree with the stated facts, units, boundaries and independent checks.
- Reasoning: explains why the result follows and identifies a limitation or unresolved question.
- Transfer: completes changed cases and revises the final project when a relevant assumption changes.
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The idea in everyday life
Final fictional comparison: A 60 W and B 12 W both supply 800 lumens, one lamp each. Initial schedule 5 h/day for 30 days: A 9 kWh, B 1.8 kWh. Updated schedule is 4 h/day for 30 days. All powers remain supplied constant estimates; no purchase, installation or actual meter test occurred.
A useful energy packet retains inputs, units, period, service match and evidence status so another reader can reproduce it. When usage changes, update the affected row and any totals or differences derived from it. Keep standardized labels separate from household measurements and retain uncertainty rather than silently changing assumptions.
Check and revise the final energy comparison — worked practice
A useful energy packet retains inputs, units, period, service match and evidence status so another reader can reproduce it. When usage changes, update the affected row and any totals or differences derived from it. Keep standardized labels separate from household measurements and retain uncertainty rather than silently changing assumptions.
Final fictional comparison: A 60 W and B 12 W both supply 800 lumens, one lamp each. Initial schedule 5 h/day for 30 days: A 9 kWh, B 1.8 kWh. Updated schedule is 4 h/day for 30 days. All powers remain supplied constant estimates; no purchase, installation or actual meter test occurred.
1. 1. Recalculate
Calculate both updated option totals.
You should see: A: 0.06×4×30=7.2 kWh; B: 0.012×4×30=1.44 kWh.
2. 2. Propagate
Update the difference and avoided fraction.
You should see: 7.2−1.44=5.76 kWh; 5.76÷7.2=80%.
3. 3. Retain
Record matched service and evidence status.
You should see: 800 lumens, one lamp, same period; fictional constant-power estimate.
4. 4. Assemble
Add the safe unused-lamp recommendation and evidence register from earlier lessons.
You should see: Final packet separates estimates, label assumptions and actual measurements without claiming a performed test.
What to finish
A final energy packet with revised rows, derived comparisons, evidence register and safe recommendation.
Watch for this
The work uses fictional operating inputs and checks the reasoning. It does not include real electrical inspection, installation or whole-home outcome measurement.
How can I tell I understand it?
Reproduce a new energy difference from changed operating duration and unchanged power assumptions.
Quick knowledge check
Answer all 3 questions. Get at least 2 right and the lesson completes automatically.
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Answer all 3 questions above and get at least 2 right. You can review the explanations and try again.
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Source & access notes · checked 2026-10-01
Web open/search showed the official page, its topic heading and relevant concept description. This is a content/source check, not a provider endorsement.
Access: Official page retrieved with the web reader on 2026-10-01; interactive tools and videos were not certified by retrieval.
Reuse: Original fictional teaching cases, calculations, questions and examples; link and short factual paraphrase only. No copied source exercises or illustrations.
Source & access notes · checked 2026-10-01
Web open/search showed the official page, its topic heading and relevant concept description. This is a content/source check, not a provider endorsement.
Access: Official page retrieved with the web reader on 2026-10-01; interactive tools and videos were not certified by retrieval.
Reuse: Original fictional teaching cases, calculations, questions and examples; link and short factual paraphrase only. No copied source exercises or illustrations.
Source & access notes · checked 2026-10-01
Web open/search showed the official page, its topic heading and relevant concept description. This is a content/source check, not a provider endorsement.
Access: Official page retrieved with the web reader on 2026-10-01; interactive tools and videos were not certified by retrieval.
Reuse: Original fictional teaching cases, calculations, questions and examples; link and short factual paraphrase only. No copied source exercises or illustrations.
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