Question

What is the current amplifier?

Answer 1

Hint: The current amplifier is classified under the category of electronic circuits. This circuit is used to magnify or increase the magnitude of the current, keeping the voltage component of the input signal unchanged.

Complete answer:
A current amplifier, an electronic circuit that is used to magnify or increase the magnitude of the current, keeping the voltage component of the input signal unchanged, finally passes this amplified signal to its succeeding circuit. Thus, the amplification of the input signal is termed as the current amplification.
The input signal can be any of the constant or the time varying waveforms. During the current amplification process, the current amplifier amplifies the current component of the input signal keeping the voltage component unchanged.
The block diagram representation of the typical current amplifier is given as follows.

Gain is the term used to rate the amplifying capability of the amplifiers.
In the case of a current amplifier, the gain represents the amount by which the magnitude of the current of the output wave is increased concerning the magnitude of the current of the input wave, because the current amplifier only transforms only the current component of the input signal.
Characteristics of an Ideal Current Amplifier-
For the entire range of the input signal, the gain of the current amplifier should remain constant.
The gain of the current amplifier should be independent of the parameters such as the temperature and humidity.
The effective resistance between the input terminals of the current amplifier (input impedance) should be equal to zero, whereas, the effective resistance between the input terminals of the current amplifier (output impedance) should be equal to infinite.
\[\therefore \] A current amplifier, an electronic circuit that is used to magnify or increase the magnitude of the current, keeping the voltage component of the input signal unchanged.

Note:
There are 2 types of current amplifiers. They are the practical current amplifiers and the ideal current amplifiers. In the case of ideal amplifiers the resistances of the components are considered to be zero, whereas, in the case of practical amplifiers, the resistance of the components are taken into consideration.