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What is the difference between a current amplifier and a voltage amplifier? Answered

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steveastrouk
steveastrouk

Best Answer 8 years ago

Here are three of the possible configurations of the topologies.

amps.jpg
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lemonie
lemonie

8 years ago

The current-amplifier gives you more power for driving big speakers. The voltage-amplifier increases the signal / data strength.
Why did you ask the question?

L

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linkan.patel
linkan.patel

Answer 7 years ago

is it right that voltage amplifire need high input impedance and low out put impedance?
and the current amplifire need low input impedance and high output impedance.

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linkan.patel
linkan.patel

Answer 7 years ago

if yes then why? then i can clear my next doubt...........please reply?

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steveastrouk
steveastrouk

8 years ago

In a current amplifier, the controlled quantity is current, and the output voltages wanders around to keep current at some value fixed by either the current at the input, or the voltage at the input (actually, a transconductance amplifier.)

In a voltage amplifier, the controller quantity is VOLTAGE, and the output CURRENT wanders around to maintain the output constant.

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Kiteman
Kiteman

8 years ago

They're opposites.

If you increase voltage, then current goes down. If you increase current, the voltage goes down.