Unit 3 electricity magnetism transistors
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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

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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.


First computer 1940 1950

First computer, 1940-1950


Computer 1960 s

Computer 1960’s


Computer 1970 s

Computer 1970’s


Computer 1980 s

Computer 1980’s


Computer 2008

Computer 2008


First television 1930 s

First Television, 1930’s


Tv 1950 s

TV 1950’s


Tv 1980 s

TV 1980’s


Tv 2011

TV 2011


First telephone 1860 s

First telephone, 1860’s


Telephone 1950 s

Telephone 1950’s


Telephone 1990 s

Telephone 1990’s


Telephone 2011

Telephone 2011


What do you notice about these gadgets over time

What do you notice about these gadgets over time?


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


Microchips in which thousands or millions of transistors are deposited on a piece of silicon

Microchips-in which thousands or millions of transistors are deposited on a piece of silicon


Transistor

Transistor

  • Are made out of metalloids.

  • Why?


Transistor1

Transistor

  • 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

  • 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


The story of the transistor continued

The Story of the Transistor Continued…

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


Unit 3 electricity magnetism transistors

  • They did countless tests on different samples of silicon & germanium.

  • In Dec. 1947, Bardeen and Brattain produced the world’s first semiconductor amplifier: the point-contact transistor


The first transistor

The First Transistor


Highest achievement nobel prize

Highest Achievement-Nobel Prize

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


Practice2

Practice

  • 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

  • Which electrical device is shown in the diagram?

    • Capacitor

    • Inductor

    • Resistor

    • Transistor


Activity 1

Activity 1

  • 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

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


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