Report Question: What is that wire made of? Most conductors we use for wires hav
ID: 2041262 • Letter: R
Question
Report Question: What is that wire made of? Most conductors we use for wires have very small resistances ( 1 S) However, the long wire in the experiment had a larger than normal resistance. Let's figure out what it is made of. Use this table of data to calculate the resistivity of the wire. Look up this value to determine what the wire is made of Some helpful math: but ?-R where A is the cross sectional area of the wire and l is the length. Thus, we can say: The value of the current through the wire is I, and is something you measured carlier. The value of the dV /da is the slope of the line of your table of data. A can be obtained from the diameter of the wire which is 750 um. The only unknown is p, the resistivity Report Question: Why does this wire exist? Normally, we want wire to be very conductive. Do some research and learn what applications exist for the type of wire in the long wire apparatus. Report on your findings.Explanation / Answer
[Answer will vary according to the data for the first part which is missing in the question's description. Although i have given a general answer that will somewhat match with the question]
Low resistance is needed where we need high current flows. High resistivity is needed for conductors while we need to protect some apparatus from high currents, as some apparatus are highly sensitive and expensive too, so we use conductors with high resistivity to safeguard the sensitive apparatus. Another application of high resistivity is heating appliances, the more the resistance the more heating is produced. Usually, it is not possible to use different types of wire for different purposes and so we can manage the length of the same wire to make different apparatus as per resistance required. (Length is more manageable than resistivity).
Low resistivity wires are expensive (like silver) so the fabrication is done using a little higher resistive wire with smaller lengths, this is also helpful where size of the apparatus matters (like ICs).