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A transistor acts like a valve or gate that opens and closes, and allows a current to flow. Since the amount of current that flows is controlled by another input, they can be used to make amplifiers. Carbon microphones and vacuum tubes have the same property, and so have also been used to make amplifiers historically.

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15y ago
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15y ago

A transistor doesn't have any mechanical parts to wear out, so it will last longer. A transistor can switch much faster than a mechanical device, so they can switch all the way from DC up into the microwave region. It is physically small. Very handy. It allows a relatively small controlling current to switch very large controlled currents.

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13y ago

Transistors are semiconductor devices that can be made very small as part of integrated circuits or can be individual devices. They can act as amplifiers and switches so they are useful in may applications in both digital and analog circuits. They come in many types suitable for different types of applications.

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13y ago

The question should be like: How can a transistor be used as an amplifier...??

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There are four mode of operations for a transisitor.

1. Forward active mode.

2. Reverse active mode.

3. Cut Off mode.

4. Saturation Mode.

To be an amplifier, transistor must be used in forward active mode.

To understand the modes, lets consider a pnp/npn transistor. In forward active mode, Emitter-Base Junction is forward biased & Collectror-Base Junction is reverse Biased.

In Reverse active mode, Emitter-Base Junction is reverse biased & Collector Base junction is forward biased.

In Cut off mode, both the junctions are reverse biased.

In Satuiration mode, both the junctions are forward biased.

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Q: Why transistor is used as an amplifier?
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Related questions

How transistor acts as a amplifier?

A transistor does not act as an amplifier. It is used as a component in an amplifier circuit.


When a PNP transistor is connected in a circuit it can be used as a power amplifier because?

A PNP transistor has no advantage or disadvantage over an NPN transistor in its ability as an amplifier. Rather, the current-handling capacities of the transistor determine if it's usable as an amplifier.


What component is typically used as an amplifier?

A transistor


When transistor acts as an amplifier then does its output voltage increase or decrease?

That depends on both the input signal and the type of amplifier the transistor is used in.


Why a transistor is used as a amplifier and switch?

transistor has 2 output 1 and 0 so can be used as a switch


Why is it necessary to bias a transistor when it is to be used as an amplifier?

Biasing is necessary in a transistor circuit to keep the transistor working. Without proper biasing, the circuit will fail


What is difference between transistor and amplifier?

A transistor is an electronic component. By itself it has little use. An amplifier is a complete, functional circuit, generally made up of several components. A transistor can be a component part of an amplifier, however an amplifier may be constructed without any transistors (using vacuum tubes instead, for instance).


How does transistor acts as an amplifier?

When transformer is used in step up mode then we can use transformer as amplifire


How does transistor acts an amplifier?

When transformer is used in step up mode then we can use transformer as amplifire


Which bjt transistor amplifier can be used as a voltage buffer?

the common collector can use as voltage buffer


What is internal gain of amplifier?

The internal gain of an amplifier is the gain or the amplification factor of the transistor used in it....................it is internal because it is fixed for transistors while manufacturing..................


Is transistor a current amplifier or voltage amplifier?

depends on the circuit it is used in:CE/CS is inverting voltage amplifierCC/CD is noninverting current amplifierCB/CG is noninverting voltage amplifier