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# electrical engineering basics around the home part ii - PowerPoint PPT Presentation

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 .

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### Electrical EngineeringBasics Around the HomePart II

UEET 101

Presented by

Donald S. Zinger

ReviewElectricity Everywhere

• Entertainment

• Communication

• Industry

• Lights

• Anything dealing with electron flow

• Electrical engineers involved in all

• Signal and Systems

• Communications

• Controls

• Digital

• Computers

• Logic Systems

• Power

• Generation and distribution

• Power conversion

• 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)

I = current

V = voltage

Z = impedance (resistance for dc)

P = power

W = energy (work)

• Find P for various voltages

• Z = 2 W

• Find a consumer need

• Determine technical specifications

• Develop system and components

• Evaluate design

• Repeat as necessary

• Calculator

• Analysis and design

• Computer

• Analysis and design software

• Simulation software

• Circuit (e.g. PSPICE)

• Simple circuit

• Battery and resistor

• Highly complicated circuits possible

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

• 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

• Light weight

• Meets original specifications

+

Batteries in Series

• Total energy increases

Pictorial

Schematic

+

Batteries in Parallel

• Total energy increases

• Current sharing problems

Pictorial

Schematic

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

• 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”

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

D Cell

C Cell

AAA Cell

AA Cell

• 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

• 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

• Emphasized in course work

• Basis of all steps of design

• Engineers should have a solid grasp of fundamentals

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

• Work in teams with others

• Electrical

• Industrial

• Mechanical

• Work with others

• Marketing

• Manufacturing

• Look at big picture

• Societal implications

• Ethical Considerations

• 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