Table of Contents
- 1 What is transistor explain working of PNP & NPN transistor as amplifier?
- 2 What is transistor explain the working of PNP and NPN transistor with circuit diagram?
- 3 How does a transistor work in electronics?
- 4 How does a BJT work as an amplifier?
- 5 How does NPN BJT work?
- 6 What is BJT and explain the construction of BJT?
- 7 How does a BJT work?
- 8 What is the difference between BJT transistor and PNP transistor?
- 9 What is the equation for base current of a bipolar NPN transistor?
- 10 How to calculate the collector current for common emitter NPN transistor?
What is transistor explain working of PNP & NPN transistor as amplifier?
Definition: The transistor in which one p-type material is placed between two n-type materials is known as NPN transistor. The NPN transistor amplifies the weak signal enter into the base and produces strong amplify signals at the collector end.
What is transistor explain the working of PNP and NPN transistor with circuit diagram?
Difference between NPN and PNP Transistor
| NPN Transistor | PNP Transistor |
|---|---|
| In this transistor, the collector terminal is a positive voltage terminal | In this transistor, the emitter terminal is a positive voltage terminal |
| The switching time of this transistor is faster | The switching time of this transistor is lower |
What is bipolar transistor explain the working of NPN and PNP transistor?
As a small current flowing into the base terminal controls a much larger collector current forming the basis of transistor action. The principle of operation of the two transistor types PNP and NPN, is exactly the same the only difference being in their biasing and the polarity of the power supply for each type.
How does a transistor work in electronics?
A transistor works when the electrons and the holes start moving across the two junctions between the n-type and p-type silicon. The small current that we turn on at the base makes a big current flow between the emitter and the collector.
How does a BJT work as an amplifier?
A transistor acts as an amplifier by raising the strength of a weak signal. The DC bias voltage applied to the emitter base junction, makes it remain in forward biased condition. Thus a small input voltage results in a large output voltage, which shows that the transistor works as an amplifier.
How does a PNP BJT work?
The PNP transistor is a type of transistor in which one n-type material is doped with two p-type materials. It is a device that is controlled by the current. When a small current flow through the base of the PNP transistor, it turns on. The current in a PNP transistor flows from the emitter to the collector.
How does NPN BJT work?
The NPN transistor is designed to pass electrons from the emitter to the collector (so conventional current flows from collector to emitter). The emitter “emits” electrons into the base, which controls the number of electrons the emitter emits.
What is BJT and explain the construction of BJT?
BJT is a semiconductor device that is constructed with 3 doped semiconductor Regions i.e. Base, Collector & Emitter separated by 2 p-n Junctions. Bipolar transistors are manufactured in two types, PNP and NPN, and are available as separate components, usually in large quantities.
What is the function of PNP transistor?
PNP transistors are used to source current, i.e. current flows out of the collector. PNP transistors are used as switches. These are used in the amplifying circuits. PNP transistors are used when we need to turnoff something by push a button.
How does a BJT work?
A BJT is a type of transistor that uses both electrons and holes as charge carriers. A signal of small amplitude if applied to the base is available in the amplified form at the collector of the transistor. This is the amplification provided by the BJT.
What is the difference between BJT transistor and PNP transistor?
The arrow for BJT transistors is always located on the emitter terminal and also it indicates the direction of conventional current flow. In PNP transistor this arrow indicates as ‘pointing in’ and the current direction in PNP is completely opposite to the NPN transistor.
What is the function of NPN transistor?
NPN Transistor. An NPN transistor receives positive voltage at the collector terminal. This positive voltage to the collector allows current to flow across from the collector to emitter, given that there is a sufficient base current to turn the transistor on.
What is the equation for base current of a bipolar NPN transistor?
The equation for base current of a bipolar NPN transistor is given by, The output collector current in common emitter NPN transistor can be calculated by applying Kirchhoff’s Voltage Law (KVL). V CC = I C R L + V CE …………
How to calculate the collector current for common emitter NPN transistor?
From the above equation the collector current for common emitter NPN transistor is given as I C = (V CC-V CE)/R L In a common emitter NPN transistor the relation between collector current and emitter current is given as I C = β I