Which company’s laboratory invented the first transistor?
Ford
Philips
Bell laboratories
Sony
What are the two main types of transistors used today?
BJT (Bipolar Junction Transistor) and MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor).
How does a transistor amplify a signal?
A small input signal controls a larger current, making the signal stronger.
What two main jobs can a transistor do in an electronic circuit?
Act as a switch and as an amplifier.
Before transistors were invented, what device was commonly used to amplify and switch signals?
Vacuum tubes
What are the three main parts (terminals) of a bipolar junction transistor (BJT)?
Emitter, Base, Collector.
Give one everyday device that would not work without transistors.
smartphones, computers, TVs, radios, calculators, cars.
What is the basic difference between a BJT and a MOSFET?
A BJT is current-controlled, while a MOSFET is voltage-controlled.
What material are most transistors made from?
Silicon
Phosphorus
Borus
Tungsten
What does the word “semiconductor” mean?
A material that conducts electricity sometimes, not as well as metals but better than insulators.
Why are billions of transistors able to fit inside a modern microchip?
Because transistors are extremely small and made using advanced manufacturing techniques.
Name one advantage of transistors compared to vacuum tubes.
They are smaller, use less energy, produce less heat, or last longer.
Why was the invention of the transistor considered a revolution for electronics?
Because transistors are smaller, cheaper, faster, more reliable, and use less power than vacuum tubes.
In what year was the transistor invented?
1995
1978
1947
1921
What is a transistor?
A small electronic component (a three terminal device) that controls the flow of electric current.
What does a transistor do when it works as a switch?
It turns current on or off.