As a design engineer, you are asked to design a lighting system consisting of a 70-W power
Question:
As a design engineer, you are asked to design a lighting system consisting of a 70-W power supply and two light bulbs as shown in Fig. 2.124. You must select the two bulbs from the following three available bulbs.
R1 = 80 Ω, cost = $0.60 (standard size)
R2 = 90 Ω, cost = $0.90 (standard size)
R3 = 100 Ω, cost = $0.75 (nonstandard size)
The system should be designed for minimum cost such that I lies within the range I = 1.2 A ± 5 percent.
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Related Book For 
Fundamentals of Electric Circuits
ISBN: 978-0078028229
6th edition
Authors: Charles K Alexander, Matthew Sadiku
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