P
Paul Burridge
- Jan 1, 1970
- 0
No, he was absolutely correct. Read it again carefully.
Yes, it would work, but what a *daft* idea! Sounds like the guy just
enjoyed being annoying.
No, he was absolutely correct. Read it again carefully.
As mentioned all conductors have some resistance. In many electronicRob B said:I did't miss earlier posts i am trying to learn more, i have always found
electronics fascinating, want to learn, and was trying to relate my obvious
limited knowledge of standard resistor attributes/properties to the concept
of wires (i.e. conductors) as resistors.
i read about resistance of wires , that most all wires ( conductors and not
super-conductor) have some resistance depending on several factors,
composition , size ( length , cross sectional area) , shape ( for inductance
issue)
i read about resistors being voltage <-> current convertors via definition
I=VR
but i could not relate tolerance and power rating to resistor wires ?
because the example given of the (0.00002 mho conductor ) as 50k ohm
resistor made me wonder where does one figure the power rating as it seems
like such a tiny wire that would easily melt at least i have have melted
bigger wires in what i thought were prett mild simple circuit
sorry to sound like giving an amateur lesson but i wanted to show that i did
put some time in to researching before wasting your time with a question
I did't miss earlier posts i am trying to learn more, i have always found
electronics fascinating, want to learn, and was trying to relate my obvious
limited knowledge of standard resistor attributes/properties to the concept
of wires (i.e. conductors) as resistors.
I did't miss earlier posts i am trying to learn more, i have always found
electronics fascinating, want to learn, and was trying to relate my obvious
limited knowledge of standard resistor attributes/properties to the concept
of wires (i.e. conductors) as resistors.
but i could not relate tolerance and power rating to resistor wires ?
because the example given of the (0.00002 mho conductor ) as 50k ohm
resistor made me wonder where does one figure the power rating as it seems
like such a tiny wire that would easily melt at least i have have melted
bigger wires in what i thought were prett mild simple circuit
sorry to sound like giving an amateur lesson but i wanted to show that i did
put some time in to researching before wasting your time with a question
The original post suggesting the use of conductors in place of
resistors was a sort of "play on words". It was a (fairly successful)
attempt to confuse.
A 1000 ohm resistor _is_ a .001 mho conductor.
Just a small nit-pick: Please use SI units, where they exist? Such as
the SI unit for conductance, the 'Siemens' (abbreviated 'S') - which also
just happens to be the same size as the 'mho', but which benefits form
being an actual international standard.
Best wishes,
// Christian Brunschen
Jasen Betts said:[snip]
a 0.00002 mho conductor is a 50000 ohm resistor, the two merely describe the
same quantity in a different way.
to convert merely take the reciprocal, if you're using a calculator with a
[1/x] button use that, otherwise divide 1 by the one quantity to find
the other.
sorry to sound like giving an amateur lesson but i wanted to show that i did
put some time in to researching before wasting your time with a question
a conductor does not need to be made of metal, as I hinted earlier carbon has
a relatively poor conductivity, so if something with a low conductance (or
high resistance) is wanted a thin layer of carbon is often used.
to achieve a 50K resistance in metal an extremely long, and/or thin,
wire would be needed
by way of comparison a 240V 15W soldering iron (which typically has a nichrome
wire heating element - atleast the cheap ones do) has a resistance of only
about 4167 ohms. (or a conductance of about 0.00024 mho)
so depending on the dimensions of the wire quite a high voltage would be
needed to push enough current through the wire to damage it.
Ralph Mowery said:[snip]i read about resistors being voltage <-> current convertors via definition
I=VR
I would not get hung up on them being voltage/current converters at all.
They are mostly power wasters and isolators. They let one power supply
voltage source do many things. They can also be thought of as restrictors
such as when used in a timming circuit with a capacitor.
Rob B said:Ralph Mowery said:[snip]i read about resistors being voltage <-> current convertors via definition
I=VR
I would not get hung up on them being voltage/current converters at all.
They are mostly power wasters and isolators. They let one power supply
voltage source do many things. They can also be thought of as restrictors
such as when used in a timming circuit with a capacitor.
well i read this purely as a definition per the I=VR equation.
But the concept of voltage/current conversion as a description of resistors
seems interesting in my amateur learning mind and kinda helped when thinking
about the reason for using resistors with transistors
do you know of a situation where thinking of resistors as convertors would
be useful
Rob said:[snip]
I would not get hung up on them being voltage/current converters at all.
They are mostly power wasters and isolators. They let one power supply
voltage source do many things. They can also be thought of as restrictors
such as when used in a timming circuit with a capacitor.
well i read this purely as a definition per the I=VR equation.
But the concept of voltage/current conversion as a description of resistors
seems interesting in my amateur learning mind and kinda helped when thinking
about the reason for using resistors with transistors
do you know of a situation where thinking of resistors as convertors would
be useful
do you know of a situation where thinking of resistors as convertors would
be useful
Rob said:Ralph Mowery said:[snip]i read about resistors being voltage <-> current convertors via definition
I=VR
I would not get hung up on them being voltage/current converters at all.
They are mostly power wasters and isolators. They let one power supply
voltage source do many things. They can also be thought of as restrictors
such as when used in a timming circuit with a capacitor.
well i read this purely as a definition per the I=VR equation.
Peter said:The original post suggesting the use of conductors in place of
resistors was a sort of "play on words". It was a (fairly successful)
attempt to confuse.
A 1000 ohm resistor _is_ a .001 mho conductor.