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

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electrical engineering basics around the home

Electrical EngineeringBasics Around the Home

UEET 101

Presented by

Donald S. Zinger

electricity everywhere
Electricity Everywhere
  • Entertainment
  • Communication
  • Industry
  • Lights
  • Anything dealing with electron flow
  • Electrical engineers involved in all
brainstorm
Brainstorm
  • List activities an electrical engineer might perform
electrical engineering major areas
Electrical Engineering Major Areas
  • Signal and Systems
    • Communications
    • Controls
  • Digital
    • Computers
    • Logic Systems
  • Power
    • Generation and distribution
    • Power conversion
areas not distinct
Areas Not Distinct

Signal and System

Digital

Power

household appliances contain all areas
Household Appliances Contain All Areas
  • Look at dissected product
  • Coffee maker
all related to electricity
All Related to Electricity
  • A fundamental property of matter, associated with atomic particles whose movements , free or controlled, lead to the development of fields of force and the generation of kinetic or potential energy.
    • Funk and Wagnall New International Dictionary of the English Language, Ferguson Publishing Company, Chicago, 1997, pp. 406
quantifying electricity
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
Basic Electrical Quantity Relationships
  • Current flow is directly proportional to the voltage and inversely proportional to the impedance.
  • Ohm’s Law
ac vs d c
AC vs. D C
  • AC – alternating current
    • Continuously varying in time
  • DC – direct current
    • Constant in long term (steady state)
ac measurements
AC Measurements
  • Zero average value
  • Use RMS to measure values
    • RMS – Root Mean Square
electrical power
Electrical Power
  • Power calculation needed for useful work
  • Instantaneous power
  • Average power

Where pf = power factor

energy calculation
Energy Calculation
  • Energy calculation relates to work done
  • Energy is power used over time
  • Equation for constant power
comparison of energy users
Comparison of Energy Users

Data from: http://www.eia.doe.gov/emeu/aer/elect.html

single residence energy use calculation
Single Residence Energy Use Calculation
  • Sum last digits of your groups ZIDs
  • Use last digit of sum to choose appliance
  • Estimate hours of use in a year
  • Estimate total energy
us average residential energy used
US Average Residential Energy Used
  • Total residential electrical energy use 2005 = 1,201,147,845 kWh

Source: http://www.eia.doe.gov/emeu/aer/elect.html

  • Number of households 2001 = 107 Million

Source: http://www.eia.doe.gov/emeu/reps/appli/us_table.html

  • Energy per household = 11.2 MWh
appliance design
Appliance Design
  • Find a consumer need
  • Determine technical specifications
  • Develop system and components
  • Evaluate design
  • Repeat as necessary
example electric glove
Example:Electric Glove
  • Developing an electrically heated glove
  • Uses resistive heat
  • Nominal heat 1 W
  • Not to exceed 2 W
  • Should last 2 hours.
battery choices
Battery Choices

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

discharge curves
Discharge Curves

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

D Cell

C Cell

AAA Cell

AA Cell

batteries in series

+

+

Batteries in Series
  • Voltages add
  • Total energy increases

Pictorial

Schematic

batteries in parallel

+

+

Batteries in Parallel
  • Current capability adds
  • Total energy increases
  • Current sharing problems

Pictorial

Schematic

challenge choose resistance and battery
Challenge: Choose Resistance and Battery
  • Light weight
  • Meets original specifications
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