How can circuit voltage affect the choice of insulator?
why does the resistance decreases as the conductor diameter increases?
how does temperature effect resistance?
please help and thank you
1.
Doesn't it make sense that higher voltages have more energy and can force themselves through more resistance so you want thicker and better insulators for higher voltages.
2.
Think of it this way. You have a large dog and a small dog and both want to crawl through a small hole in a fence. The small animal can get through the small hole rather easily but the large dog has more trouble; BUT if you increase size of the hole the larger dog can do that do. Putting this in electrical terms, the larger diameter conductor makes it easier for more electrons to flow.
3.
Higher temperatures increase the activity of molecules/electrons/atoms which makes it easier for MOST metals to conduct a flow of electrons.