Unit 8: Unit 8: Electronics and TechnologyElectronics and Technology

Section 1: Section 1: Electronic Signals & SemiconductorsElectronic Signals & Semiconductors Objectives:Objectives:

Define and compare digital and analog signalsDefine and compare digital and analog signals Describe the use of semiconductorsDescribe the use of semiconductors

Assessment Anchor:Assessment Anchor: S8.A.3.2S8.A.3.2 S8.A.3.3S8.A.3.3

What is electronics?What is electronics?

The use of electricity to control, The use of electricity to control, communicate, and process informationcommunicate, and process information Based on electronic signalsBased on electronic signals

Electronic signal – a varying electric Electronic signal – a varying electric current that represents informationcurrent that represents information

Analog vs. Digital SignalsAnalog vs. Digital Signals

Analog – current is Analog – current is varied smoothly to varied smoothly to represent informationrepresent information

Ex: Playing a recordEx: Playing a record

Digital – current Digital – current changes in stepschanges in steps

Ex: Playing a CDEx: Playing a CD

SemiconductorsSemiconductors

We already talked about conductors and We already talked about conductors and insulators…what about semiconductors?insulators…what about semiconductors?

Definition: a material that conducts Definition: a material that conducts current better than insulators, but not as current better than insulators, but not as well as conductorswell as conductors

Examples of semiconductorsExamples of semiconductors

Diode – allows current to flow in only one Diode – allows current to flow in only one directiondirection

Transistor – amplifies electronic signal or Transistor – amplifies electronic signal or switches current on or offswitches current on or off

Integrated Circuit – a circuit manufactured Integrated Circuit – a circuit manufactured on a tiny piece of semiconductor (chip)on a tiny piece of semiconductor (chip)

Section 2: Section 2: Electronic CommunicationElectronic Communication

Objectives:Objectives: Explain the difference between AM and FM Explain the difference between AM and FM

radio signalsradio signals Apply the EM Spectrum to data transmissionApply the EM Spectrum to data transmission

Assessment Anchor:Assessment Anchor: S8.A.3.2S8.A.3.2 S8.A.3.3S8.A.3.3

Electromagnetic WavesElectromagnetic Waves

EM Waves allow for electronic signals to EM Waves allow for electronic signals to be carried over long distancesbe carried over long distances

TelephonesTelephones

Transmitter –converts sound into an Transmitter –converts sound into an electronic signalelectronic signal

Receiver – converts electronic signal back Receiver – converts electronic signal back to soundto sound

RadiosRadios

AM RadioAM Radio

AM = Amplitude AM = Amplitude ModulationModulation

The amplitude of the The amplitude of the wave is changedwave is changed

FM RadioFM Radio

FM = Frequency FM = Frequency ModulationModulation

The frequency of the The frequency of the wave is changedwave is changed

Section 3: Section 3: The Binary SystemThe Binary System

Objectives:Objectives: Describe how the binary system worksDescribe how the binary system works Convert numbers between binary and base-10Convert numbers between binary and base-10

Assessment Anchor:Assessment Anchor: S8.A.3.2S8.A.3.2 S8.A.3.3S8.A.3.3

Binary SystemBinary System

Uses combinations of 0 and 1 to represent Uses combinations of 0 and 1 to represent informationinformation

How does the binary system work?How does the binary system work?

Placeholders represent the numbers: 1, 2, Placeholders represent the numbers: 1, 2, 4, 8, 16, 32, etc…4, 8, 16, 32, etc…

The 0 and 1 represent how many of each The 0 and 1 represent how many of each placeholder there areplaceholder there are

Then you add the numbers togetherThen you add the numbers together

Practice with the binary systemPractice with the binary system

1616 88 44 22 11 NumberNumber

11

1515

3131

88

More Practice with the binary More Practice with the binary systemsystem

1616 88 44 22 11 NumberNumber

00 11 00 11 00

11 11 11 11 00

00 00 00 11 00

11 00 11 11 00