4.1.2 Transistors Flashcards
What are transistors used for?
For switching and controlling current within a circuit.
What does a bipolar junction transistor symbol look like?
Circle with three lines and a thick bar in the circle.
What does a unijunction transistor symbol look like?
Circle with three line, inside the circle is like a castellation.
What does a phototransistor symbol look like?
Circle with three lines, and arrows pointing toward the circle.
What does a junction field effect transistor symbol look like?
Three lines into a circle and a hollow thick bar
What does a metal oxide semi conductor field effect transistor symbol look like?
Circle with three lines, inside the circle is three small squares.
Who invented the transistor?
Bell telephone Laboratories
Depending on the structure, how are transistors classed?
Junction or Field Effect Transistors
What is the most basic transistor?
Bipolar Junction
What are the three parts of a bipolar junction?
Emitter, Base and collector
What are field effect transistors controlled by?
The action of an electron field rather than carrier injection.
Why were field effect transistors known as unipolar?
Refers to the fact the current is transported by carriers of one polarity.
What is the control difference between field effect and bipolar?
Bipolar uses current, FET uses voltage.
When a BJT is fully on or saturated how does it act?
Like a switch
When a BJT is operating between the region of cut off and saturation how does it act?
Like an amplifier
