Resistance of a Wire
The investigation is about how a piece of wire can affect the
resistance. I'm trying to find out, if the resistance will change and
why if there is a different length of metal/wire, Nichrome.
Resistance is like a constriction in the flow and it's the pressure
has to work against. So if the voltage is increased the move current
will flow but if you increase the resistance less current will flow
(because of the pressure has to work against). The current in the
metal wire is carried by electrons. These electrons move through the
wire but as there is obstruction in the wire, the electrons move past
the obstruction but produces friction. This causes the wire to heat up
and vibrate.
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I will use amp meter, volt meter, power pack, connecting leads,
Metal/wire and a ruler.
I will change the length of wire/metal after every time I take the
record because that's what im measuring. I will keep everything else
the same, so it will be a fair test. I will do three tests on one
length and take an average of that length. This would be fair because
encase of any flukes there will be an average of the other two.
Overall I will test the resistance at every 10 cm or 20 cm because
this will give me more data to get a set of results from and will
increase the dependability of the results.
To back up the results, I could use a different material to test the
resistance upon or a different method or equipment but still using the
same material. This would give more evidence to the results I will get
in my first experiment using Nichrome.
I will use preliminary experiments to get my real experiment more
reliable and exact. Using the preliminary experiments I will test the
length, to see which would be better, going down in 10cms or 20cms.
Prediction
I predict that when the length of the wire is increase the resistance
How am I going to make it a fair test I will use a clean flask for
To make it a fair test, I will measure the amount of gas given off
4) Repeat this same test three time in order to gather and average later on.
The raw data which I have been given is in list form and provides me
equation V = IR. V - volts, I - current and R - resistance. I plotted
To make sure it is a fair test; the procedure is repeated a couple of
50cm for us. The current will be kept on the same level using the same
repeat the process 3 times in total to ensure a fair test. At the end
I also decided to use a wooden block to keep hold of the wire, because
it seemed to be closer to test tube 1 therefore I estimated it to be
it is a fair test by switching on an alarm for exact timing. Also I
To ensure that we get a good set of results, we will do each test
· When I have collected my results I will place them in a table like
Factors Affecting the Resistance of a Wire The aim of this experiment is to investigate one factor that affect the resistance of a wire. I will do this by performing an experiment. First I will need to identify the factors that effect resistance. There are a few factors that affect the resistance, it is determined by the properties an object has.
setting, at the end I will assess them on how they would fair in front