GRADE 8 SCIENCE · CHAPTER 1
Engineering & design
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Engineering design
Check an energy design against a target
Calculate useful-output efficiency and compare measured performance with a design requirement.
AN EXAMPLE FROM THIS CHAPTER
A model device receives 100 J and transfers 70 J as its intended useful output. The design target is at least 60% useful-output efficiency. Does this trial meet the target?
Show answer & explanation
Yes, it meets the target.
Useful-output efficiency = × 100 = 70%. Compare this with 60%; yes, it meets the target.
Curriculum & source notes
These are original Little Play study books organized around U.S. school topics. The official curriculum references below guide topic scope and progression. Coverage is selected, not a complete curriculum or a verified match to every state standard. They are not copies of a publisher’s textbook. Check your school’s syllabus and book edition.
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