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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.
  • 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!


-Much smaller.

-Allowed technology to become more compact

-Transistors amplify electric signals/currents

  • 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
  • Are made out of metalloids.
  • Why?
  • 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
  • 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.
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.
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
highest achievement nobel prize
Highest Achievement-Nobel Prize
  • William Shockley, Walter Brattain and John Bardeen shared the 1956 Nobel Prize in Physics.
  • 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
  • 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.