eet 110 – survey of electronics chapter 1 basics of electricity

EET 110 – Survey of EET 110 – Survey of ElectronicsElectronics

Chapter 1Chapter 1

Basics of ElectricityBasics of Electricity

IntroductionIntroductionElectrical SystemsElectrical Systems– DiagramsDiagrams

Block (system)Block (system)

PictorialPictorial

SchematicSchematic

– ComponentsComponentsSourceSource

PathPath

ControlControl

LoadLoad

IndicatorIndicator

Energy, Work and PowerEnergy, Work and Power

EnergyEnergy– Kinetic EnergyKinetic Energy– Potential EnergyPotential Energy– Chemical EnergyChemical Energy

Work Work – Conversion of EnergyConversion of Energy

PowerPower– Rate at which work is doneRate at which work is done

Structure of MatterStructure of Matter

AtomAtom– Mode of AtomMode of Atom– ElectronsElectrons– NucleusNucleus

NeutronsNeutrons

ProtonsProtons

– OrbitOrbit– Valence LayerValence Layer

Electrical ChargesElectrical Charges

Like charges repelLike charges repel

Opposites attractOpposites attract

Each charge is surrounded by an Each charge is surrounded by an electrostatic fieldelectrostatic field

Static ElectricityStatic Electricity

A collection of charged particles A collection of charged particles accumulated on a materialaccumulated on a material

ExamplesExamples– LightningLightning– Dry Montana effectDry Montana effect

Electrical CurrentElectrical Current

Movement of electrons – current flowMovement of electrons – current flow

Potential for electrons to flow – Potential for electrons to flow – voltage or electrical potentialvoltage or electrical potential

ConductorsConductors– Single electron in valence layerSingle electron in valence layer

Insulator Insulator – Full valence layerFull valence layer

Other materialOther material

SemiconductorsSemiconductors– Exactly four electrons in the valence Exactly four electrons in the valence

layerlayer

SuperconductorsSuperconductors– The Holy Grail of electronicsThe Holy Grail of electronics– No resistance AT ALLNo resistance AT ALL

Electrical CircuitsElectrical Circuits

Conventional Current FlowConventional Current Flow

Electron flowElectron flow

ChargeCharge– 1 coulomb = 6.25x101 coulomb = 6.25x101818 electrons electrons

Rate of electron flowRate of electron flow– 1 Ampere or 1 Amp = 1 Coulomb per 1 Ampere or 1 Amp = 1 Coulomb per

secondsecond

Electro-Motive ForceElectro-Motive Force

EMF EMF

Voltage Voltage

Electrical PotentialElectrical Potential

Measured in VoltsMeasured in Volts

ResistanceResistanceThe opposition to current flowThe opposition to current flowDependent onDependent on– Material Material – LengthLength– AreaArea– TemperatureTemperature

Measured in OHMSMeasured in OHMSThe inverse of conductance (Mhos or The inverse of conductance (Mhos or Siemens)Siemens)

FormulasFormulas

Current is given as ICurrent is given as I

Voltage as either V or EVoltage as either V or E

Resistance as RResistance as R

AssignmentAssignment

Read Chapter 2 – complete review Read Chapter 2 – complete review questionsquestions

Locate the web pageLocate the web page

techsci.msun.edu/strizich/index.htmltechsci.msun.edu/strizich/index.html