Answer
360.9k+ views
Hint: A transistor which is configured as common emitter, common base and common collector. Emitter is always forward biased with respect to base to supply majority charge carriers to the base. Collector terminal is always reverse biased with respect to the base to remove the charge carriers from the base collector junction.
Complete step-by-step solution:
An amplifier is a device which is used for increasing the amplitude of input signals.in an amplifier there are two input terminals for connecting input and two output terminals for connecting load. In a common emitter configuration, base is one of the input terminals and collector is one of the output terminals.
For proper functioning of a transistor, the emitter-base junction is forward biased and collector-base junction must be reverse –biased.
The input impedance of common emitter configuration with ${{V}_{CE}}$ as constant is given as:
${{Z}_{E}}=\dfrac{\Delta {{V}_{BE}}}{\Delta {{I}_{B}}}$
Where ${{V}_{BE}}$ = Voltage across base and emitter
$\Delta {{I}_{B}}$ = Base current
Base current is of order of few microamperes so the input impedance is very low
So the correct option is A.
Note: In common emitter circuits its current, voltage and power gains are quite high and the ratio of output impedance and input impedance are quite moderate. As it provides high voltage gain and moderate current gain. Common emitter circuits are well suited for voltage amplification for low frequencies.
Complete step-by-step solution:
An amplifier is a device which is used for increasing the amplitude of input signals.in an amplifier there are two input terminals for connecting input and two output terminals for connecting load. In a common emitter configuration, base is one of the input terminals and collector is one of the output terminals.
![seo images](https://www.vedantu.com/question-sets/d19f487b-5062-4779-9240-63ba90e9c9378662099102476754287.png)
For proper functioning of a transistor, the emitter-base junction is forward biased and collector-base junction must be reverse –biased.
The input impedance of common emitter configuration with ${{V}_{CE}}$ as constant is given as:
${{Z}_{E}}=\dfrac{\Delta {{V}_{BE}}}{\Delta {{I}_{B}}}$
Where ${{V}_{BE}}$ = Voltage across base and emitter
$\Delta {{I}_{B}}$ = Base current
Base current is of order of few microamperes so the input impedance is very low
So the correct option is A.
Note: In common emitter circuits its current, voltage and power gains are quite high and the ratio of output impedance and input impedance are quite moderate. As it provides high voltage gain and moderate current gain. Common emitter circuits are well suited for voltage amplification for low frequencies.
Recently Updated Pages
Mark and label the given geoinformation on the outline class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
When people say No pun intended what does that mea class 8 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Name the states which share their boundary with Indias class 9 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give an account of the Northern Plains of India class 9 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Change the following sentences into negative and interrogative class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Advantages and disadvantages of science
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
Bimbisara was the founder of dynasty A Nanda B Haryanka class 6 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Which are the Top 10 Largest Countries of the World?
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
10 examples of evaporation in daily life with explanations
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give 10 examples for herbs , shrubs , climbers , creepers
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
How do you graph the function fx 4x class 9 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference Between Plant Cell and Animal Cell
![arrow-right](/cdn/images/seo-templates/arrow-right.png)