impedance between two terminals of a passive network

[Sean McIlroy]

hi all

apparently there is a well-defined impedance between any two terminals
in an electrical network that contains only passive components
(resistors, capacitors, inductors, independent power sources). why is
this the case? any help would be very much appreciated.

peace
stm

 

[BobW]

"Sean McIlroy" <sean_mcilroy@yahoo.com> wrote in message
news:5d92ce49-efb5-4993-a40d-e28508ebb6e2@s8g2000prg.googlegroups.com...

hi all

apparently there is a well-defined impedance between any two terminals
in an electrical network that contains only passive components
(resistors, capacitors, inductors, independent power sources). why is
this the case? any help would be very much appreciated.

peace
stm

Why wouldn't there be? Were you able to answer your other homework
questions?

Bob

 

[Sean McIlroy]

Why wouldn't there be?

another deep-thinking engineer

Were you able to answer your other homework
questions?

wrong again, bumwipe. none of them would give you the time of day, but
there are in fact people who sustain an independent intellectual
life.

 

[poogie]

On Dec 1, 7:57 pm, Sean McIlroy <sean_mcil...@yahoo.com> wrote:

hi all

apparently there is a well-defined impedance between any two terminals
in an electrical network that contains only passive components
(resistors, capacitors, inductors, independent power sources). why is
this the case? any help would be very much appreciated.

peace
stm

There is an impedance which is that of air. For proof look at the
standard TV. The antenna which you connect matches the impedance of
air; which if I recall correctly is 300 ohm. By extension this is the
Z for match Z on the input or terminals for the device.

 

[Rich Grise]

On Thu, 06 Dec 2007 13:09:10 -0800, poogie wrote:

On Dec 1, 7:57 pm, Sean McIlroy <sean_mcil...@yahoo.com> wrote:

apparently there is a well-defined impedance between any two terminals
in an electrical network that contains only passive components
(resistors, capacitors, inductors, independent power sources). why is
this the case? any help would be very much appreciated.

There is an impedance which is that of air. For proof look at the
standard TV. The antenna which you connect matches the impedance of air;
which if I recall correctly is 300 ohm. By extension this is the Z for
match Z on the input or terminals for the device.

Actually, air is closer to 377 ohms; the folded dipole is about 300, but
it itself is an impedance transformer.

Hope This Helps!
Rich