I have drawn a predicted graph to show what i assume i will find
(as the length of my constantan wire increases then the resistance will increase also)
Is this relationship directly proportional?
2006-12-03 03:54:13 · 4 answers · asked by Jen 1 in Education & Reference ➔ Homework Help
If the points that you create are along a straight line (or look close since this is an experiment,) this it is a directly proportional relationship. This should either be a directly or inversely proportional relationship; I don't understand the experiment fully as described.
2006-12-03 04:02:19 · answer #1 · answered by J G 4 · 0⤊ 0⤋
The resistivity of a wire = RA/l
where R = resistance, A = cross-sectional area and l = length of wire.
Knowing that the resistivity is a constant (for a certain material, e.g. copper), and assuming that A is a constant, we notice that R is proportional to l.
So the answer if "yes", the resistance of a wire is directly proportional to the length of the wire.
2006-12-03 04:05:48 · answer #2 · answered by Kemmy 6 · 0⤊ 0⤋
The resistance of your wire is generally given in ohms/meter. Double the length of wire - double the resistance between the ends. This is a direct rlationship R = L * Ohms/Meter and will produce a 'straight line graph' when R (Resistance) is the vertical Y axis and L (length) is the horizontal X axis.
2006-12-03 04:05:27 · answer #3 · answered by Mark R 2 · 0⤊ 0⤋
well it depends
2006-12-03 04:14:46 · answer #4 · answered by Anonymous · 0⤊ 1⤋