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amplifier types

Discussion in 'General Electronics Discussion' started by bhuvanesh, Mar 23, 2014.

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  1. bhuvanesh

    bhuvanesh

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    Aug 29, 2013
    i want to be clear of what actually current and voltage amplifier does.and how it varies from power amplifier.thank you in advance
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    A current amplifier amplifies current.
    A voltage amplifier amplifies voltage.
    A power amplifier amplifies power (voltage*current).

    That was easy, wasn't it?
     
  3. bhuvanesh

    bhuvanesh

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    Aug 29, 2013
    one more doubt why does voltage amplifier need high input resistance and 0 output resistance current amplifier need 0 input resistance and high output resistance.explain in detially.thank you
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    You don't want to draw current froma voltage source, therefore you need high input impedance.
    You don't want the output voltage to drop when current is drawan, therefore you need low output impedance.

    With a current amplifier it's the other way round: A current source works best when the load impedance is low and the source impedance is high.


    Look up voltage source and current source e.g. in the Wikipedia.
     
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