Answered: Device Efficiency Electric generators…

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter27: Current And Resistance

Section: Chapter Questions

Problem 27.66AP: An all-electric car (not a hybrid) is designed to run from a bank of 12.0-V batteries with total...

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1. Suppose you left a 150-W light bulb on continuously for one hour. If the electricity generation and transmission efficiency is 80%, how much chemical energy (in KJ) was transferred from the power plant

2. To what height would an object have to be raised so that its gravitational potential energy would equal the kinetic energy it would possess if it were moving at 5 m/s? (Hint, Potential E = Kinetic E)

According to the table below, what is the overall efficiency of the process for converting Fuel cell energy into fluorescent lighting in your home?

(Use average efficiency ratings, Assume an electrical transmission efficiency of 90%)

Device
Efficiency
Electric generators
70-99%
(mechanical » electrical)
Electric motor
50-90%
(electrical » mechanical)
Gas furnace
70-95%
(chemical - thermal)
Wind turbine
35-50%
(mechanical > electrical)
Fossil fuel power plant
35-40%
(chemical → thermal → mechanical → electrical)
Nuclear power plant
30–35%
(nuclear → thermal → mechanical → electrical)
Automobile engine
20-30%
(chemical → thermal → mechanical)
Fluorescent lamp
20%
(electrical » light)
Incandescent lamp
5%
(electrical » light)
Solar cell
5-28%
(light → electrical)
Fuel cell
40-60%
(chemical → electrical)

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