What type of metal are used to make rheostat or resistance wire?
554269
A mix of copper and nickle called constantan
30784
increasing thickness, decreasing temperature, and decreasing length would all reduce the resistance of a metal wire. so the only thing that reduces it by increasing is thickness.\n\na good way to remember this is just to reason it out. if the wire is thicker, current can move more freely and with less resistance then a thinner, more constricted wire. the electrons in the current would have more space to move around.  if you increase temperature, it would cause more resistance, because with temperature, comes heat, and heat just makes more resistance. lower temperatures allow the current to move more freely, which is why superconductors work really well at low temperatures. and length, well the longer the wire is, the more the resistance is going to build up along the whole thing... the electrons are just encountering more resistance because the wire is longer..
41902
usually 18-20 gage steel wire. though you can get them in plastic and or various other metals aluminum and or titainium for example though i cant see why youd want them unless you were to use them for a VERY non standard application
971687
why do you need it?  how much do you want to spend to figure out what it is, or what alloy it is. \n\nyou can just do the density measurement\nmeasure the radius of the wire and length. \ndo the pi r squared length deal and then weigh it, and run it through the density equation. \n\nyou need a ruler and a calipers or micrometer that reads in inches. \n\nso lets say you have .125 inch wire.  divide that by 2 to get the radius. =  .0625"\nthen square it.  .0039" and multiply by 3.14. \n\nand multiply it by the length in inches  \n\nthen weigh it.  in lbs. \n\ndensity of al is between .096 lb/cu in. and .100 lb/cu in\n\nyou might want to buy wire that is certified as the type of aluminum you need.  the stuff is cheap.  you can get at the electical supply store or maybe a hardware store. \n\nwiring used for electical applications is 8000 series alloy for modern applications \n\nolder wire is 1350 alloy.
419109
I don't remember the ordering, but there's probably some metal out there that won't react?  Gold, maybe?  For regular metal, that sounds a bit iffy.
1178634
A ductile substance is easily pulled or stretched into a thin wire without breaking.\n\n"...gold is the most ductile metal and one gram of it can be drawn into a wire 2,300 meters long."\n\n"The order of ductility of some familiar metals is gold > silver > platinum > iron > copper > palladium > aluminum > zinc > tin > lead"
699534
My guess would be Duraluminium (an Aluminum alloy) orsome sort of titanium alloy... \n\nDuraluminium is used in harddisks as the ring separating the platters and in expensive bikes.
409972
Try "Memry Corporation"\n\nSince 1981, they specialise in Nitinol materials, products and design; they manufacture shape memory and superelastic nitinol and pseudoelastic materials.\n\nThey are deemed to be the worldwide leadership for nitinol wire, superelastic, pseudoelastic or linear elastic products.
178800
To make a motor you need 28 guage copper wire that will have a dark tinted laquer on it. You cannot see it except it is usually darker than copper. In other words you can sand it off when you need to solder it or make a connection. You can buy this wire at radio shack I think.
145303
Basically, you just need two different types of metals to generate a current. I assume your using copper as your other metal type.\n\nIf you dont have any zinc wire, you could try using a galvanized (zinc coated) screw.\nOr if you want to use another metal all together, try Aluminum in the form of Aluminum foil.  An Iron nail or a chunk of lead would also work, but not as well.
964775
electropneumatic circuit \n\nhttp://www.festo-didactic.com/ov3/media/customers/1100/0000607001156324537.pdf\n\n:>peace
313989
It is the wire that you use to make a chain link fence
967084
I would use a length of nichrome wire (see links below) stretched between a couple copper blocks. You could make some sort of pinch block out of the copper and connect a power supply to the copper. (or drill a hole through it with a set screw, tap a hole and us a pan head screw)  You will have to insulate the copper from the rest of the world so you don't short something out.  G-10 (a glass/epoxy resin) makes a good moderately high temperature insulator.  One of the contacts should be fixed and the other allowed to "float" and allow for changes in the length of the wire due to heating.  A spring could be used to provide tension or an air cylinder.  The power supply will depend on the length and diameter wire you choose.  If there is a problem with the electrical contacts heating up, you could run some cooling water through them.  Just drill a hole through it and 1/8 NPT pipe tape both ends.  You can plumb some water to it and it will keep the copper chilled.
805744
Tungsten mostly, but there are other metals used. There are also gasses that glow too in bulbs that have no filiment wire.
636584
"Many metals, such as copper, bronze, silver, brass, and some steels, readily react with solder to form strong chemical and physical bonds. Other metals, such as aluminum, high alloy steels, cast iron, and titanium, range from very difficult to impossible to solder."\n\n"Soldering Hints\nA useful *anti-flux* is ordinary toothpaste."
700634
i heard there are tiny metals ranging in size between\nmicrodots and pieces of wire 1/3rd of an inch.
1087898
It isn't the only material for light filaments but it is the most used material. \n\nThe lamp industry represents the largest commercial application of tungsten wire. It is used in this application because it displays excellent creep resistance at elevated temperatures. Tungsten is an attractive lamp filament material because it has an extremely high melting temperature (~3,695 K) and a low vapour pressure at high temperatures. Tungsten is also intrinsically brittle and, initially, this prevented the manufacture of tungsten wire.  But advances in metallurgy enabled tungsten wire and coil filaments to be handled without breakage, so tungsten became the backbone of the whole incandescent lamp industry.