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2.61 As a design engineer, you are asked to design a ead lighting system consisting of a 70-W power supply and two light bulbs as shown in Fig. 2.124. You must select the two buibs from the following three available bulbs. R = 80 2, cost = $0.60 (standard size) R, = 90 2, cost = $0.90 (standard size) R, = 100 2, cost = S0.75 (nonstandard size) The system should be designed for minimum cost such that / lies within the range /= 1.2 A± 5 percent. 70-W Power Supply DR. Ry

2.61 As a design engineer, you are asked to design a ead lighting system consisting of a 70-W power supply and two light bulbs as shown in Fig. 2.124. You must select the two buibs from the following three available bulbs. R = 80 2, cost = $0.60 (standard size) R, = 90 2, cost = $0.90 (standard size) R, = 100 2, cost = S0.75 (nonstandard size) The system should be designed for minimum cost such that / lies within the range /= 1.2 A± 5 percent. 70-W Power Supply DR. Ry

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Please answer this and show solution, thank you. ANSWER: Use R1 and R3 bulbs. Explain why. 

2.61 As a design engineer, you are asked to design a ead 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. R = 80 2, cost = $0.60 (standard size) R, = 90 2, cost = $0.90 (standard size) R, = 100 2, cost = S0.75 (nonstandard size) The system should be designed for minimum cost such that / lies within the range /= 1.2 A± 5 percent. 70-W DR. Power Ry Supply
Transcribed Image Text:2.61 As a design engineer, you are asked to design a ead 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. R = 80 2, cost = $0.60 (standard size) R, = 90 2, cost = $0.90 (standard size) R, = 100 2, cost = S0.75 (nonstandard size) The system should be designed for minimum cost such that / lies within the range /= 1.2 A± 5 percent. 70-W DR. Power Ry Supply
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