What are transistor amplifiers, Electrical Engineering

Assignment Help:

Q. What are transistor amplifiers? What is meant by efficiency of an amplifier? What is amplifier coupling?

The AMPLIFIER is a device that enables an input signal to control an output signal. The output signal will have some (or all) of the characteristics of the input signal but will generally be larger than the input signal in terms of voltage, current, or power. A transistor amplifier is a current-control device. The current in the base of the transistor (which is dependent on the emitter-base bias) controls the current in the collector.

Once current is controlled it can be used to give a voltage gain or a power gain. The efficiency of an amplifier refers to the amount of power delivered to the output compared to the power supplied to the circuit. Since every device takes power to operate, if the amplifier operates for 360° of input signal, it uses more power than if it only operates for 180° of input signal. If the amplifier uses more power, less power is available for the output signal and efficiency is lower. Since class A amplifiers operate (have current flow) for 360° of input signal, they are low in efficiency.


Related Discussions:- What are transistor amplifiers

Describe in brief how email system works, Describe in brief how email syste...

Describe in brief how email system works Following is a simple description of how email system works: -  Sender composes a message (and attaches a file if required) and send

Types of sweeps, There are four basic types of sweeps: (a)             ...

There are four basic types of sweeps: (a)                                Free Running or Recurrent Sweep: in the free running or recurrent sweep, the sawtooth waveform is re

Induction motor, principle and operation of 3phace induction motor

principle and operation of 3phace induction motor

Explain the meaning of ring counters, Explain the meaning of Ring Counters?...

Explain the meaning of Ring Counters? A ring counter is fundamentally a circulating shift register in which the output of the most significant stage is fed back to the input of

Can you show the decimal to octal conversion, Q. Can you show the Decimal t...

Q. Can you show the Decimal to Octal Conversion? To convert decimal to octal is somewhat more difficult. The usual method to convert from decimal to octal is repeated division

What are shift register counters, What are Shift Register Counters? Two...

What are Shift Register Counters? Two of the main common types of shift register counters are the Ring counter and the Johnson counter and They are basically shift registers wi

Spread time - power semiconductor devices , Spread Time (t s ) During  ...

Spread Time (t s ) During  spread time anode  voltage  falls from 10% I a  to the  on state  voltage  drop  and anode  current  rises  from 90% I a   to final  value  of anode

transmisson medium, Can I find out the salution of electrods Transmissio...

Can I find out the salution of electrods Transmission medium light sound uncoupling magnet for high dc cycle.

Explain the effect of a dielectric on behaviour of capacitor, Explain the e...

Explain the effect of a dielectric on the behaviour of a capacitor. If two parallel plates are separated by a distance 'd' (meters) in vacuum and are kept at a potential diffe

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd