Transistor Flashcards
What are the two basic types of transistors?
NPN and PNP
What is a transistor?
Transistor are made by connecting three piece of semiconductor material together.
What is the difference between NPN and PNP?
NPN transistor must have a positive voltage connected to the collector and a negative voltage connected to the emitter
PNP transistor must have a positive voltage connected to the emitter and negative voltage connect to the collector
The term that is made up of three layers of semiconductor material
Bipolar-Junction Transistor (BJT)
the term transistor comes from the words “_____” and “_____”
“transfer” and “Resistor”
If two block of N-type semiconductor material are separated with a very thin layer of P-type semiconductor material, then an __________ is created.
NPN transistor
Transistor have three leads. Name the three leads
Base (centre)
Collector (without arrow)
Emitter (with arrow)
If two block of P-type semiconductor material are separated with a very thin layer of N-type semiconductor material, then an __________ is created.
PNP transistor
the emitter arrow of the transistor always points from _______ to ______
P-type to N-type
the only basic difference between using NPN and PNP style of transistors is in the…….
Polarity of connection
what is a simple definition of an “amplifier”?
Amplifier is a device that controls a large current with a very small current.
what advantages does transistor have than relay?
- it has no contacts to pit
- No coil to burn out
- no moving parts to wear down
When base current is reduced to a value close to zero or large value of Rb, then no collector current is allowed to flow. This is known as
Cut-off
What does it mean, when the transistor amplifier circuit, have a voltage source is lower than VRc?
the circuit is Saturated
the beta of a transistor can be anywhere in the range of ________
10 to 500
The emitter-base junction of a transistor is _______ biased, the collector-base junction is ______ biased.
Forward, Reverse
The arrow on the emitter of a transistor indicated points from _______ to ______.
P-type to N-type
The two of the major applications of transistors are for the purpose of ______ and ______.
switching and amplifying
The NPN transistor mush have a _______ voltage connected to _______ and a _______ voltage connected to the emitter.
postive, collector
negative,
The PNP transistor mush have a _______ voltage connected to _______ and a _______ voltage connected to the ________.
positve, emitter
negative, collector
the base must be connected to to same polarity as the collector to forward bias the transistor. True or false
True
How can you identify the type of transistor?
Using ohm meter.
If the postive lead of the ohmmeter is connected to the base of the transistor, _____________________.
a diode junction should be seen between the base-collector and the base-emitter.
