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Low and High impedance terminology

Discussion in 'Electronic Basics' started by zalzon, Aug 17, 2003.

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  1. zalzon

    zalzon Guest

    Keep reading this has a 'low impedence' and that has a 'high
    impedance'. What really does it mean?

    Does a high input impedance device not draw much current when attached
    to a circuit? What is an example of a high impedance load?

    How about low impedance. What are some examples of low impedance
    loads?

    I'm thinking of input and output impedance in terms of resistance to
    the flow of current. Is this right? The greater the impedance,
    probably the more current is needed to drive it.
     
  2. Guitar amplifier inputs.
    Amplifier outputs.
    Yes.

    The greater the impedance,
    No, The more voltage is needed to drive it for a given current. Current
    is a flow of charge.

    Kevin Aylward

    http://www.anasoft.co.uk
    SuperSpice, a very affordable Mixed-Mode
    Windows Simulator with Schematic Capture,
    Waveform Display, FFT's and Filter Design.
     
  3. JeffM

    JeffM Guest

    ...high input impedance
    also
    high impedance --> more susceptible to noise
    (lower currents == more susceptible to noise currents)

    low impedance --> less susceptible to noise
    (higher currents == less susceptible to noise currents)
     
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