An Introduction to Electrical Engineering

59 slides
5.57 MB
688 views

Similar Presentations

Presentation Transcript

1

An Introduction to Electrical EngineeringAaron GliebermanAugust 5, 2010

2

Bureau of Labor Statistics, U.S. Department of Labor, 2010

3

Earnings distribution by engineering specialty, May 2008 Bureau of Labor Statistics, U.S. Department of Labor, 2010

4

Average Starting Salaries: July 2009 survey by the National Association of Colleges and Employers Bureau of Labor Statistics, U.S. Department of Labor, 2010

5

Overview-Brief history, disciplines, curriculum -Review of electrical principles Guest Speaker: Dr. Jerry Daniels, Ph.D. Lab visit: Daniels Lab

6

What is electrical engineering?The study of ELECTRICITY along with its numerous applications

7

A brief historyIn 1600, William Gilbert called the property of attracting particles after being rubbed “electricus”.De Magnete was a treatise of electricity and magnetism, noting a long list of elements that could be electrified.A versoriumGilbert invented the versorium, a device that detected statically-charged bodiesWilliam Gilbert, arguably the first electrical engineer

8

A brief history1800 – voltaic pile developed by Alessandro Volta, a precursor to the battery1831 – Michael Faraday discovers electromagnetic induction1873 – Electricity and Magnetism published by James Maxwell, describing a theory for electromagnetismVoltaic pileCircuits containing inductorsMaxwell’s equations

9

A brief history1888 – Heinrich Hertz transmits and receives radio signals 1941 – Konrad Zuse introduces the first ever programmable computer1947 – invention of transistorSpark-gap transmitterZ3 computerTransistor

10

A brief history1958 – integrated circuit developed by Jack Kilby1968 – first microprocessor is developedIntegrated circuitsMicroprocessor

11

So where is the field now?

12

Fields of studyPower: Creation, storage, and distribution of electricityControl: Design of dynamic systems and controllers for the systemsElectronics/Microelectronics: Design of integrated circuits, microprocessors, etc.Signal Processing: Analysis of signals

13

Telecommunications: Design of transmission systems (voice, data)Computer: Design and development of computer systemsInstrumentation: Design of sensors and data acquisition equipmentFields of study

14

Curriculum at BrownEngineering coreSpecialty classes-Bioelectrical engineering-Communications systems-Computer engineering-Multimedia signal processing-Microelectrode systems-Solid state electronics and Optoeletronics-Basic engineering (statics, dynamics, electromagnetism, thermodynamics, fluid mechanics) -Basic chemistry -Basic math (multivariable calculus, statistics, differential equations)Advanced electrical classes-Signal analysis-Digital electronics

15

Basic concepts✴ Electricity ✴ Charge ✴ Current ✴ Voltage ✴ Power and Energy

16

ElectricityPhysical phenomenon arising from the existence and interactions of electric charge

17

ChargeWhere can we observe/experience/use charge?

18

ChargeCharacteristic property of subatomic particles responsible for electric phenomena1.602×10−19 C−1.602×10−19 C-+ElectronProtonThe unit of quantity of electric charge is coloumb (C) 1 coloumb = 6.25 × 1018 e e = elementary charge = charge of proton

19

Charge“Charged” particles exhibit forcesOpposite charges attract one anotherLike charges repel each other--+-Charge is the source of one of the fundamental forces in nature (others?)

20

Coulomb’s Lawq1q2r (meters)(Newtons)F1,2 is the electrostatic force exerted on charge 1 due to the presence of charge 2ke is the Coulomb constant ke = 8.987 x 109 N*m2*C-2

21

Electric currentDescribes charge in motion, the flow of chargeThis phenomenon can result from moving electrons in a conductive material or moving ions in charged solutions

22

Electric currentAn ampere (A) is the number of electrons having a total charge of 1 C moving through a given cross section in 1 s.As defined, current flows in direction of positive charge flow

23

Electrical Circuits

24

Electric circuitAn electric circuit is an interconnection of electrical elements linked together in a closed path so that electric current may flow continuouslyCircuit diagrams are the standard for electrical engineers

25

Rate of flow of charge form node a to node bRate of flow of charge form node b to node a(i = current)A direct current (dc) is a current of constant magnitudeAn alternating current (ac) is a current of varying magnitude and direction

26

VoltageDriving “force” of electrical current between two pointsVabVbaVoltage at terminal a with respect to terminal bVoltage at terminal b with respect to terminal aVab = -Vba Note: In a circuit, voltage is often defined relative to “ground”

Browse More Presentations

Last Updated: 8th March 2018

Recommended PPTs