Life-Cycle Energy & Resource Accounting — Drills · Grade 12 Science
Chapter: Energy, Water & Material ResourcesWhat these drills covers
By the end of Life-Cycle Energy & Resource Accounting you should be able to:
- I can compare equal service through a defined life-cycle boundary.
- I can calculate break-even use and distinguish capacity factor from efficiency.
2 questions, numeric and written answer, each with a worked explanation.
Vocabulary used: embodied energy, functional unit, capacity factor.
Problem 1
Delivered energy 300MJ, invested 30MJ. Find modeled EROI.
Hints
Write the relationship first; substitute with consistent units.
Answer and explanation
10
300/30=10.
Problem 2
Why specify a functional unit?
Answer and explanation
It ensures the alternatives provide comparable service.
Response criteria
- State a scientifically accurate conclusion.
- Show the calculation or mechanism that supports it.
- Include units, conditions, or limits where relevant.