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Low and High impedance terminology

Z

zalzon

Jan 1, 1970
0
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.
 
K

Kevin Aylward

Jan 1, 1970
0
zalzon said:
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?

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

Amplifier outputs.
I'm thinking of input and output impedance in terms of resistance to
the flow of current. Is this right?

Yes.

The greater the impedance,
probably the more current is needed to drive it.

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

Kevin Aylward
[email protected]
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
 
J

JeffM

Jan 1, 1970
0
...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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