Why does resistivity of semiconductors decrease with increase in temperature?
It is because of the energy gap between the conduction band and valence band, at very low temperatures the conduction band of semiconductors are almost empty, i.e it has no charge carriers and hence resistivity is high, but as the temperature increases more and more electrons jump to the conduction band and the resistivity decreases on account of high number of charge carriers,What happens in metal is that the conduction band and valency band overlaps, so a metal always have charge carriers, increasing the temperature only increases the collision of this electrons and resistivity increasesone thing to further note is even at high temperatures metal tends to be better conductor than semiconductors at same temperatures.
Do gold plated jacks really make a difference?
For audio, no. The quality of the female socket, particularly the quality of the spring steel makes a lot more difference. Good contact in a decent plug socket system is almost never a problem; if it is, it's likely dust/dirt, which gold will not magically cure. Most signal loss problems I encounter are bad solder issues or insufficient strain relief, which kills the solder joints.I did once specify gold contacts for an audio install, but that was a bar with five overhead doors that opened directly onto the beach. I didn't want a call at the end of the season because the salt air corrosion had killed the speaker connections.Now with the low signal inside a computer it's different, but since this was posted in music, I'm guessing you aren't talking about chip to board connections.Get good cables, don't fall for the hype.
Which is a better conductor: gold or silver? What's the best conducting metal?
It depends on what type of conditions the silver or gold will be put through in practice. Silver is great until it tarnishes then that coating interferes with conductivity. In harsher conditions gold is better as its less prone to this interference in conductivity.All That Glitters is Not Gold: Silver as a Connector Finish
Why are gold and silver not suited for electrical wire?
In the case of Gold it should be easy to see: Gold is simply WAY to expensive to use it except in special applications. Gold doesn’t tarnish which makes it a really good metal to use in connectors. Here a layer of Gold as thin as possible (money again) is applied to a base metal. Keeps the contacts conductive. The other main use of Gold in electronics is bond wires within chip cases. The chemical inactivity is again the main factor here.Silver has the highest conductivity of all metals, but although a lot cheaper than Gold, it STILL costs about 60 times as much as Copper. In addition to that, Silver is chemically highly active which is something you don’t want to have in a wire.Aluminium (or Aluminum as some parts of the world insist to call it) is sometimes used in wires as it costs only about a third of Copper with roughly half the conductivity, which makes wires slightly cheaper. But Aluminium forms an Oxide layer with bad conductivity on the outside so most of the times it’s plated with Copper to make up for that. But those wires are a pain in the a** and prone to lose their conductivity in mechanical contacts (like in plugs) which then have a tendency to heat up and start fires. They should be outlawed.So, unless you are willing to pay a fortune for wires and you don’t like your house to burn down, you stay with Copper.
Is galvanized steel a good conductor of electricity?
I am trying to make a electric fence from scrap so my dogs will stop getting out. I used the galvanized steel about 30 feet of it. I used the wire that is used to build a metal fence. Is that good? I also used one of the bars of galvanized steel that are about 4 feet tall and 1/2 a inch wide and 1/8 an inch thick that is used to tighten the fencing. I used that to stick into the ground to ground the electric fence. Is that good? I am using a lawn mower battery that is 300 cranking amps and 350 cold cranking amps for the charge. Is that good? i have it hooked together with jumper cables. Is that good? I am using 3 foot pieces of wood to make the fence and to hold the wire with a nails to hold it in place. Is that good? It is not shocking the dogs hard enough, it is just a little tiny shock. if you hold a metal thing to it, it will not prduce a shock. What am I doing wrong? What should I change? Please give me any ideas that you have and as well as answer my questions. Thank you very much. And just so you know i really dont want to shock my dog I love him very much. I figure he only needs to be shocked a couple of times and then he will stop. It this or chaining him up. I just cant stop him from getting out and if he got hit by a car or if somebody stole him or if somebody killed him I dont know what I would do. He is a pit bull also so he can take some pain. Thank you very much. I dont have enough money for a fence.