GRADE 11 SCIENCE · CHAPTER 1
Engineering & design
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Engineering design
Select a backup design for a specified load
Evaluate a model backup system against power, duration and cost requirements.
AN EXAMPLE FROM THIS CHAPTER
System A: supplies 70 W; tested duration 4 h; cost 8 units. System B: supplies 65 W; tested duration 2 h; cost 5 units. System C: supplies 50 W; tested duration 5 h; cost 4 units.
A model backup system must supply at least 60 W for at least 3 h under the stated test. Which eligible system has the lowest listed cost?
Show answer & explanation
System A
Both power and duration must pass. System A has the lowest listed cost among the qualifying systems; the conclusion applies to these stated trials.
Curriculum & source notes
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