Electrical engineering basics around the home part ii
Download
1 / 23

Electrical Engineering Basics Around the Home Part II - PowerPoint PPT Presentation


  • 218 Views
  • Uploaded on

Electrical Engineering Basics Around the Home Part II. UEET 101. Presented by Donald S. Zinger. Review Electricity Everywhere. Entertainment Communication Industry Lights Anything dealing with electron flow Electrical engineers involved in all. Electrical Engineering Major Areas .

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Electrical Engineering Basics Around the Home Part II' - betty_james


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Electrical engineering basics around the home part ii l.jpg

Electrical EngineeringBasics Around the HomePart II

UEET 101

Presented by

Donald S. Zinger


Review electricity everywhere l.jpg
ReviewElectricity Everywhere

  • Entertainment

  • Communication

  • Industry

  • Lights

  • Anything dealing with electron flow

  • Electrical engineers involved in all


Electrical engineering major areas l.jpg
Electrical Engineering Major Areas

  • Signal and Systems

    • Communications

    • Controls

  • Digital

    • Computers

    • Logic Systems

  • Power

    • Generation and distribution

    • Power conversion


Quantifying electricity l.jpg
Quantifying Electricity

  • Current

    • Flow of positive electrical charge

    • Measured in Amperes

  • Voltage

    • “Pressure” that causes current to flow

    • Measured in volts

  • Impedance

    • Circuit opposition to current flow

    • Resistance in many circuits

    • Measured in ohms (W)


Basic electrical quantity relationships l.jpg
Basic Electrical Quantity Relationships

I = current

V = voltage

Z = impedance (resistance for dc)

P = power

W = energy (work)


Example calculations l.jpg
Example Calculations

  • Find P for various voltages

  • Z = 2 W


Design process l.jpg
Design Process

  • Find a consumer need

  • Determine technical specifications

  • Develop system and components

  • Evaluate design

  • Repeat as necessary


Tools of electrical engineer l.jpg
Tools of Electrical Engineer

  • Calculator

    • Analysis and design

  • Computer

    • Analysis and design software

    • Simulation software

      • System (e.g. Simulink)

      • Circuit (e.g. PSPICE)


Example of pspice l.jpg
Example of PSPICE

  • Simple circuit

    • Battery and resistor

  • Highly complicated circuits possible


Other tools laboratory equipment l.jpg
Other Tools Laboratory Equipment

  • Testing and evaluation

  • Meters

    • Measure average& RMS values

  • Oscilloscopes

    • Measure time varying values

  • Others

    • Signal generators

    • Spectrum analyzers

    • Etc.


Example electric glove l.jpg
Example:Electric Glove

  • Developing an electrically heated glove

  • Uses resistive heat

  • Nominal heat 1 W

  • Not to exceed 2 W

  • Should last 2 hours (90% of nominal power).


Challenge choose resistance and battery l.jpg
Challenge: Choose Resistance and Battery

  • Light weight

  • Meets original specifications


Batteries in series l.jpg

+

+

Batteries in Series

  • Voltages add

  • Total energy increases

Pictorial

Schematic


Batteries in parallel l.jpg

+

+

Batteries in Parallel

  • Current capability adds

  • Total energy increases

  • Current sharing problems

Pictorial

Schematic


Battery choices l.jpg
Battery Choices

From: http://www.duracell.com/oem/Pdf/others/alkaline.pdf


Class problem l.jpg
Class Problem

  • Divide into groups (4 to 5 people)

  • Decide on a set of batteries and a resistance

  • A number of designs will be randomly chosen and simulated

  • All designs meeting spec will be compared for weight

  • Lowest weight to meet specs will be “winner”


Discharge curves l.jpg
Discharge Curves

From: http://www.duracell.com/oem/primary/alkaline/alkaline_manganese_data.asp

D Cell

C Cell

AAA Cell

AA Cell


What was done l.jpg
What was done

  • Found a consumer need

    • Desire for warm hands

  • Determined technical specifications

    • Previously defined

  • Developed system and components

    • Found battery and resistance

  • Evaluate design

    • Simulated

    • Eliminated unsuitable designs


Should repeat cycle l.jpg
Should Repeat Cycle

  • Where specifications proper?

    • 1 W enough?

    • 2 Hrs long enough?

  • Would design work as expected?

    • Simulation model

    • Need to build to actually check?

  • Other factors

    • Glove materials

    • Reliability

    • Reproducibility


Math science and engineering skills needed l.jpg
Math, Science, and Engineering Skills Needed

  • Emphasized in course work

  • Basis of all steps of design

  • Engineers should have a solid grasp of fundamentals


Technology changes l.jpg

Technology always changing

Computer processing power

Other areas as well

Need to keep active

Technology Changes

Graph from: http://www.awe.co.uk/main_site/scientific_and_technical/publications/discovery/pdf/discovery_july_2001/computers.pdf


Engineers not alone l.jpg
Engineers Not Alone

  • Work in teams with others

    • Electrical

    • Industrial

    • Mechanical

  • Work with others

    • Marketing

    • Manufacturing

  • Look at big picture

    • Societal implications

    • Ethical Considerations


Summary l.jpg
Summary

  • Electrical engineers involved in many designs

  • Design requires many interconnected steps

    • Based on fundamentals

    • Constantly improving

  • Keep the big picture

    • Team work

    • Society as a whole


ad