I can tell you something about electric properties: a conductive material becomes less conductive if it gets hotter, vice versa if it gets colder.
Also current flowing on a wire makes it hotter.
Fast (and hope easy) explanation: current ( I ) is composed of electrons flowing from one side to the other of the material (let's assume a copper wire). We "tell" the electrons where we want them to go by applying some potential (the voltage) at the ends of the wire (the plus and minus of a battery). The electrons have the natural behaviour of moving around in a chaotic way, they get the energy for this movement from the heat of the copper. So if the copper becomes hotter ==>the electrons are more chaotic ==> you need more Voltage to make them go where you want.
In the equation V=IR (Ohm's law) hotter material means an increase in R, so if the V doesn't change you have less current for the equality to hold.
There are experiments in superconductors taken at temperatures near absolute zero (-273 °C), but I don't know much about this.
The other equation is W=R*(I^2). Heat generation is quadratic with the current (and with the Voltage, if you substitute the other equation) and if this heat isn't dissipated in some way then the temperature rises until the material melds (now you know why there are heatsinks and fans on your CPU...).
I don't remember anything about magnetic properties and temperature.
Bye,
Mirco
Hi Microacc -
Muchas gracias - you don't realize how many little puzzles you just helped solve ;)
KB
Hi Kristen,
Magnetism works basically the same.
The more you cool a magnetic material, the better its magnetism. In the other direction you have what's called the "curie" temperature, which is where the heating of the magnet gets to the point that the atoms lose their magnetic alignment.
The really serious magnetic fields such as are used to contain and direct Deuterium plasma for fusion reactors, or contain antimatter, are typically produced using large coils of supercooled copper wire. This comes back to the effect supercooling has on the flow of electricity. The interesting thing with supercooling is you can turn copper into a magnetic material if you lower its temp enough (liquid nitrogen usually does it).
I haven't rummaged through the internet on the topic yet, so I can't give you any good site references. Sorry.
Again, if there is something more specific you're looking for, let me know.
more knowledge to you,
James.
Something else that is interesting kinda along the same lines. Our bodies have a nutural magnetism evident in every cell in our bodies. When the natural polarity of our cells is disrupted, illness occurs. Hardening of the arteries is causes by too much natural electricity running through us blocking the veins. That's why putting magnets close by an infected portion of our body where the illness is, helps sometimes. It repolarizes the cells. Too much positive or too much negative charges can cause bad things in our body due to the imbalance. We are electrial beings and as such need to be balanced in order to remain healthy. Too much of anything can be bad.
This is why I think energy play in the form of raising energy makes us feel so much better. We are possibly repolarizing ourselves in a natural way...
Some might not agree with this, but I feel convinced of this.. I also find it interesting that the the more you cool a magnetic material that the greater it's magnetic properties become.. Isn't that kinda along the lines of energy raising? Don't our body temperatures drop slightly during energy raising when we are successful.. Is it possibly that during the energy raising our body temperature drops naturally as an occuring part of the process of the energy raising, as WE increase our own bodily magnetism because we are also a conductive material..... Food for thought anyway..
Blossom
Just wanting to learn....
Hi There -
I am reseaching the thermal properties of electromagnetic systems - trying to figure out what the effects of heat and cold are on such systems, with a view toward understanding a particular dream I had.
I've come across quite a bit of specialized information that is so technical that I am lost...
Anyone know anything in this particular area or know of a resource that could be aptly titled thermal properties of electromagnetic systems for dummies?
Thanks!
Kristen