What is the difference between Power Amplifier and Voltage Amplifier?

Nishant

• Sep 2nd, 2014

Voltage amplifiers have a high voltage gain, while power amplifiers have a high power gain. In most voltage amplifiers, current gain is very low, while power amplifiers have a significant cur...

ana_m

 Profile Answers by ana_m Questions by ana_m

• Jan 24th, 2009

Power amplifiers basically amplify both current and voltage (p=v*i).Voltage amplifiers only amplify the voltage.

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neha pal

• Sep 5th, 2014

Scr stands for silicon controlled rectifier.bcz it is a three terminal four layer device and use for power amplification purpose.

updesh upadhyay

• May 16th, 2013

A silicon-controlled rectifier (or semiconductor-controlled rectifier) is a four-layer solid state current controlling device. The name "silicon controlled rectifier" or SCR is General Electrics trade name for a type of thyristor.

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supersindhu

 Profile Answers by supersindhu Questions by supersindhu

• Sep 12th, 2014

Antenna is a passive element because it cannot generate energy of its own

Neha Pal

• Sep 5th, 2014

Antenna is called passive device bcz active device isn the device which do not require any external power bcz it has a power like stabilizer which is active device, bt in case of antenna this is use bcz of receiving signal from other then broadcast the system

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Why we need biasing for Transister, FET and MOSFET.?What is the importance of the biasing in transister circuits.

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microelectronics  

 Profile Answers by microelectronics Questions by microelectronics

• Member Since Oct-2009 | Dec 25th, 2009

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Biasing of transistor circuits is done for making it work in the desired region of operation.?

supersindhu

 Profile Answers by supersindhu Questions by supersindhu

• Sep 12th, 2014

Biasing is required to make transistor in active mode

Sagar21p

 Profile Answers by Sagar21p Questions by Sagar21p

• Oct 7th, 2010

Biasing means operationg the transistors in a particular region it could be either active(linear),cuttoff(off swith),saturation(nonlinear)For BJT*active region it acts as an amplifier EB jn is FB and ...

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Why vestisial side band is used in TV Signal Transmission?

supersindhu

 Profile Answers by supersindhu Questions by supersindhu

• Sep 12th, 2014

To reduce bandwidth vestigial side band is used

kumar praveen bodu

 Profile Answers by kumar praveen bodu Questions by kumar praveen bodu

• Mar 23rd, 2010

Television broadcasting requires both amplitude as well as frequency modulation AM for picture and FM for sound, so we require larger bandwidth to broadcast in order to say 5MHZ for each individu...

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Umer Farooq

• Sep 16th, 2014

PLC is programmable logical controller which individually perform while DCS consists of number of PLC's, so the control is distributed to these PLC's

muhammed hashif

• Oct 2nd, 2011

plc stands for programmable logic controller.dcs stands for distributed control system.functions of plc and dcs are same.both are using for as a instrumentation controller.but dcs are very advanced,it...

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What type of Television Communication is used in India?a) NTSCb) PALc) SECAMd) NSTC

mohd sameer

• Oct 3rd, 2014

Pal (phase alternation line)

saba iqbal

• Sep 13th, 2014

PAL System

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Eng.Daudi

• Dec 27th, 2014

16 mosfets

rucha thakur

• Dec 18th, 2014

One

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Thermistors Resistancea) increases as heat increasesb) decrease as heat increases C) remains constantd) It is nowhere related to heat.

devworx

• Jan 18th, 2015

Can be Ntc ( N - negative) as R
and Ptc (P - positive) as R

kesavamoorthy

 Profile Answers by kesavamoorthy Questions by kesavamoorthy

• Apr 6th, 2011

To easy to remember when you keep this formula in your mind.where,ΔR = change in resistanceΔT = change in temperaturek = first-order temperature coefficient of resistanceThermistor is clas...

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garrettpatton

 Profile Answers by garrettpatton Questions by garrettpatton

• Feb 20th, 2015

This is very nice and really appreciating.
you can also visit site for more information.

rajesh

• Sep 18th, 2014

To remove the unwanted signals

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What is the difference between LED's and PN junction diode?Why cut in voltage is high for LED's?

Kishan Vaghani

• Feb 20th, 2015

In LED all energy converted into a light when in PN junction all energy converted into a heat

jhabua

 Profile Answers by jhabua Questions by jhabua

• Jun 27th, 2011

LEDs are made of direct band gap elements whereas as general PN junctions are made of indirect band gap elements.In LEDs while a carrier is making transition from conduction to valence band the releas...

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What is meant by grid computing?

Kapil Rana

• Mar 11th, 2015

Grid computing is the collection of computer resources from multiple locations to reach a common goal. The grid can be thought of as a distributed system with non-interactive workloads that involve a ...

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What is difference between a multiplexer and encoder? also What is the between demultiplexer and decoder?

manoj

• Apr 2nd, 2015

Multiplexer is converted many signal to one signal by multipexing and encoder is encrypt single for sequrity.

demux and decoder is same work but opposite

hagos haftu

• Jan 14th, 2015

Yes it is very useful but as comment the description of the combination circuits should be supported by their practical circuits ,,,,the rest it is good

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Why BJT is known as current controlled device and FET is known as voltage controlled device?

swathi

• Apr 9th, 2015

In BJT we give input as a current to the base so it operates taking small input current signal and gives large output current signal so it is called current controlled.
in FET we give input voltage signal to the gate so the output will be of current signal so it is called voltage controlled device.

uzipereg

 Profile Answers by uzipereg Questions by uzipereg

• Jul 30th, 2011

For Active BJT: Ic = BETHA * Ib
(the collector/output current is controlled by the base/input current)

Saturated MOSFET: Id= 0.5*u*Cox*(W/L)*Vod, where Vod is the overdrive voltage: Vod= Vgs - Vt
(the drain/output current is controlled by the overdrive voltage)

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How to Convert Binary to Excess 3 Code and vice versa?

Ramkrishna

• Apr 16th, 2015

Simply add 011 in each binary number...

Deepanwita Saha

• Feb 4th, 2015

Why binary code converted to the excess three code?
?Binary to excess three code conversion short theory.

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akshay manmode

• Apr 30th, 2015

Amplitude modulation: the encoding of the carrier wave by variations of its amplitude in accordance with an input signal.
A broadcast system that uses amplitude modulation.

noise in modulation: noise produced by undesirable amplitude variations of radio-frequency signal.

ravi

• Apr 25th, 2015

7805 voltage regulator

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What frequency bands are used in Satellite Communication?

Ankit Kant

• May 14th, 2015

Microwave bands are used in satellite communication. In gigahertz, their ranges are:
L : 1-2
S : 2-4
C: 4-8
X: 8-12
Ku: 12-18
K: 18-26.5
Ka : 26.5-40
Q : 33-50
Onwards, we have U, V, W, F, D bands.

gani

• May 1st, 2015

L,c,s,x,ku,k,ka,v,w

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Which one of the following is used for high speed power application?a) BJTb) MOSFETc) IGBTd) TRIAC

Kunjan Shinde

• Jun 10th, 2015

BJT is faster than MOSFET
BJT consumes more power than MOSFET..

for High speed power applications they can use MOSFET at the input end and BJT at the output.

Ashish Patel

• Apr 22nd, 2015

MOSFET

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What is Modulation?Why we Require Modulation?

Ankush Bisht

• Jul 11th, 2015

It is the process of mixing the data s/g with carrier s/g
It is required so that to travel the s/g up to a long distance

NAGA TEJA

 Profile Answers by NAGA TEJA Questions by NAGA TEJA

• Mar 16th, 2015

By varying the characteristics of carrier signal in accordance with the instantaneous values of message signal....

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Why are the 2 input terminals of an op-amp are called as inverting & non-inverting terminals?

SUJITH

• Jul 15th, 2015

A high Input at inverting terminal with respect to other give a inverted output where as a high input at non-inverting terminal gives the same as output

krishnakant

• Jul 31st, 2014

The differential amplifier can perform all the arithmetic operations such as addition subtraction even integration so need operational amplifier but basically it is a directly coupled high gain amplif...

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