CAIE IGCSE Physics Qualitative Efficiency
Practise explaining efficiency as the share of input transferred usefully and identify where unwanted energy remains or is transferred to the surroundings.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- interpret a highly efficient device as transferring little input energy to unwanted stores
- name a specific unwanted transfer, such as heating the surroundings or overcoming friction
- explain reduced efficiency by identifying energy retained in moving air, liquid or apparatus
1.7.3.3—Understand, qualitatively, the concept question 1
Fig. 2.1 shows a wind turbine.
Fig. 2.1
Suggest why some of the kinetic energy of the air that passes through the circular area swept out by the blades is not converted into electrical energy.
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