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Unit 3 Electricity & Magnetism- Transistors. Physics 5d. Students know the properties of transistors and the role of transistors in electric circuits. The Story of the Transistor.

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Unit 3 electricity magnetism transistors

Unit 3 Electricity & Magnetism-Transistors

Physics 5d.

Students know the properties of transistors and the role of transistors in electric circuits


The story of the transistor
The Story of the Transistor

  • Bell Laboratories-originally the research and development arm of the telephone company American Telephone and Telegraph (AT&T)

  • One of the first pioneering advances of Bell Labs in 1900s was the vacuum tube.

  • Vacuum tube-amplified faint telephone signals and high speed on-off switch.
















They get smaller why
Theyget smaller!!!!WHY?


Because transistors replaced vacuum tubes
Because transistors replaced vacuum tubes


Practice
Practice

  • Why are modern radios, calculators, and computers much smaller than they were in the past?

    • A. Modern appliances use less electricity

    • B. Electricity has become more expensive

    • C. Vacuum tubes replaced larger transistors

    • D. Transistors replaced larger vacuum tubes


Vacuum tubes
Vacuum Tubes

Before transistors came along, vacuum tubes worked as switches and amplifiers. Notice how LARGE they are!


Transistors
Transistors

-Much smaller.

-Allowed technology to become more compact

-Transistors amplify electric signals/currents


Transistors1
Transistors

  • So…what are they?

    • A semiconductor device used to amplify and switch electronic signals and power.

  • Are found embedded in integrated circuits (aka microchips) used in computers, mobile phones, digital appliances, etc.

  • Make modern radios, calculators, computers smaller than before



Transistor
Transistor deposited on a piece of silicon

  • Are made out of metalloids.

  • Why?


Transistor1
Transistor deposited on a piece of silicon

  • Are made out of metalloids.

  • Why?

  • Because they have properties of BOTH metals and non-metals

  • This allows them to be “altered” and manipulated to be more versatile


Practice1
Practice deposited on a piece of silicon

  • What makes semiconductors useful in everyday electronic devices?

    • A. Electrons can flow at any current

    • B. Electricity is conducted better than by metals

    • C. Current flow can be resisted better than by insulators

    • D. Conductivity can be altered by adding other materials.


Transistor in drawings
Transistor in drawings deposited on a piece of silicon


The story of the transistor continued
The Story of the Transistor Continued… deposited on a piece of silicon

  • William Shockley (theoretician) selected Walter Brattain (experimental physicist) and John Bardeen (theoretical physicist) to create a semiconductor amplifier.




Highest achievement nobel prize
Highest Achievement-Nobel Prize germanium.

  • William Shockley, Walter Brattain and John Bardeen shared the 1956 Nobel Prize in Physics.


Practice2
Practice germanium.

  • What is the function of a transistor in an electrical device?

    • A. Reducing current to prevent overheating

    • B. Inducing a magnetic field to urn a motor

    • C. Controlling a large current output to amplify an electric signal

    • D. Storing an electrical charge that is used as a source of power


Practice3
Practice germanium.

  • Which electrical device is shown in the diagram?

    • Capacitor

    • Inductor

    • Resistor

    • Transistor


Activity 1
Activity 1 germanium.

  • 1. You will be in groups of 3 or 4

  • 2. List 5 devices that affect me most

  • 3. Tell which device is important in your life

  • 4. Describe how your life would change without each device

  • 5. Then as a whole, compare & contrast each team’s list


Activity 2
Activity 2 germanium.

  • Write an essay on the electronic device that most changed your life.


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