Investigating Whether the Surface Area or the Length of the Carbon Putty Will Affect Its Resistance Planning I am investigating
of whether the length or the surface area of the putty will have
effect on its resistance. We know from the book of Ordinary Level
Physics by A.F Abbott that the resistance of a conductor is affected
by several factors: Surface area: Thick wires may be regarded as
equivalent to a number of thinner wires of equal area joined in
parallel. Doubling the area will therefore halve the resistance This
means that the surface area is inversely proportional to its
resistance R âÐ1 A Length Double the length of the wire will double
the resistance as twice the length of the wire is equivalent to two
equal resistance in the series. R âÐ l Temperature The resistance for
a metallic conductor is a constant if the temperature and other
physical properties remained constant. In general, for metallic wires,
the higher the temperature, the larger its resistance. But for some
materials e.g. carbon and semi conductors like silicon and germanium,
the higher the temperature, the lower its resistance. The resistance
of most of the alloys, e.g. manganin and constantan, is only affected
slightly by a change in its temperature. I am investigating the
affects of the length and of 1/cross section area (1/A) as both of
this factor is connected to its physical effects. It is much harder to
record the temperature of the conductor than to measure the surface
area or the length of the carbon putty. And the experiments to
investigate these factors should hopefull...
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...an not be rolled thinner
There are some limitations on this experiment as the carbon putty took
so long to shaped and the experiment itself took long to do. As we
also only have a specific amount of putty, we were not able to make an
extra long carbon putty or to make an extra fat one. I would like to
increase the range of my reading as my reading range is very small,
and therefor I was only able to get a small viewof the real graph, but
If I was doing the experiment in a bigger range, I might have a better
picture of the result. For further experiments I would like to measure
the temperature of the room to see whether a small temperature change
have effect on the resistance of the carbon putty as we were doing the
experiment in couple of days time and therefore during that time,
there must be some temperature changes.
In conclusion the experiment was carried out and had great success proving my prediction to be correct and enabling solid and valid results which were able to be put in a graph. I believe my prediction could have been more accurate or more backed up if I had made a quantitative prediction. Though what I believed would happen did happen during the experiment which helped to understand the graph and the results which led me to be able to write a thorough report on them.
To continue the experiment further I can use a different source of light to test the intensity of light. For the food coloring experiment, I could use a different food color such as yellow or orange to test.
In order to find a good set of results for this experiment I need to
In the experiment I will change the wing length 10 times and cut 1 cm
nice scatter block graph. I also made a graph by hand. I set up the scale by
Take a bit of the same colored clay you used for the head, and soften it, and roll it out into a small snake. Take the toothpick, and cut it in half. Roll the first half into a small ball and lay it aside. Do this to the other half and lay it aside. Try and not make fingers.
-lots of masking tape -motor -2 5cm screws -rubber bands (thick and small) -1 5x5cm circular container & lid -3 rulers, each 30cm long -teal & glitter spray paint -nails & hammer -4 7x7cm wood disks -hack saw -1 1.5cm wide and 30cm long pipe -power drill with 5mm bit -Stanley
have to be across the wire and not just anywhere in the circuit so it
Just apply some glazing putty on the small imperfections, and then sand the glazing putty with sand paper. Use a shop vacuum to remove all of the dust and residue left over from sanding. Wipe down the surface using a damp towel, which will help remove any loose dust on the surface.
I also decided to use a wooden block to keep hold of the wire, because
Resources needed: the materials required by the US chain might be other than wood ...
gotten perfect results and correct hypothesis. Also plastic isn't the best material to be used for
another copy of a tape, as well as a blank tape. Stick them both in to the
Aim: In this experiment the goal is to find out what is the strongest cling wrap out of the two cling wraps being tested. A scientific law that can be used in this experiment is Hooke’s law, which is a way of measuring the stretch of a solid object. The information gained from calculating Hooke’s law will help answer the question of what is the strongest cling wrap, the information will be captured in a graph.
The use of a pipette pump may have been useful for larger holes, although in this case a smaller basic pipette should have been used.