7.2.6—Energy conservation and efficiency
- Syllabus
- First assessment 2026
- Objective
- 7.2.6
- Level
- SL
Less Service or Less Energy Per Service?
Conservation reduces the service used; efficiency delivers the same service with less energy.
Both can lower demand, but rebound behaviour can consume part of an efficiency gain.
Turning off an unused lamp is conservation; an LED giving the same light with less electricity is efficiency.
Which is efficiency? same light, lower electricity per light-hour.
Efficiency is not identical to using less service.