Answered: Device Efficiency Electric generators…

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter29: Introduction To Quantum Physics

Section: Chapter Questions

Problem 10CQ: If you pick up and shake a piece of metal that has electrons in it free to move as a current, no...

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Question

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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