ElectronicsStudents will be able to

Contrast different electronic signalsDescribe semiconductors Explain how phones transmit soundDescribe how sounds are transmitted

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Electronics

Electrical Device vs ElectronicsElectrical device - Continuous electricity

Electronics – Used to communicate information

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Signals Types

Analog

Varies smoothly to represent information

DigitalRepresents information in pulses or steps

109

Semiconductors

Conductor

Easily transmits electric current

Insulator

Does not transmit electric current

*Semiconductor

In between – Conducts only under special conditions

110

Semiconductor Types

110

Diode

Allow current to only flow in one direction

Can convert AC to DC

Can be used as a switch

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Transistors

Amplifies an electronic signal

Switches current on/off

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Integrated Circuits

Semiconductors that contains many diodes, transistors, and other components all together in one thin slice

Often called chips

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Telephones

Sound converted into electronic signal for transmission and then converted back into sound

Invented by Alexander Bell 1876

Contains three parts

Transmitter

Receiver

Dialing Mechanism

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Telephones

115

Sound Recordings

Analog Recordings

116

Sound Recordings

Digital Recordings

117

Electromagnetic Waves

Electric field and magnetic field

Travel together in wave pattern

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AM vs FM

118

Radio

120

TV

121

Types of TV

Cathode-ray tubes

Red-Green-Blue colored dots project on screen

Liquid Crystal

Plasma

Heat up gasses that will glow different colors

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Question of Day

Describe the difference between analog and digital signals. Explain how this affects the way that records and CD are made.