Answered: 1600 efficacy 70 23 (8 hours! (220…

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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Question

A 100 W CFL light manufactured by Buyer’s Choice consumes 23 watts and
has an illumination rating of 1600 lumens and service life of 8000 hours and
costs $1.81. As an alternative, a generic 100 W incandescent light bulb costs
$0.38 and produces 1500 lumens and has a service life of 750 hours. Let us
compare the performance of each light bulb by calculating the efficacy for
each light, and also estimating how much it would cost to run each light for 8
hours per day for 220 days in a year. We will assume electricity costs 9 cents
per kWh.
For the Buyer’s Choice 100 W CFL light:

1600
efficacy
70
23
(8 hours!
(220 days)(23 W)i
day
( 1 kW $0.09
(1000 w ji kWh.
cost
= $3.64
For the generic incandescent 100 W light bulb:
1500
efficacy
15
100
8 hours
(220 days)(100 W)
day
1 kW_}{ $0.09)
(1000 W j{ kWh }
cost =
= $15.84
It should be obvious that the CFL light is more efficient and economical to
operate than the generic incandescent.

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