Investigating What Factors Affect the Resistance of a Wire
For this investigation I am going to investigating a factor which
effects resistance of a wire.
Resistance is measured in ohms (Ω). It is a measure of how hard it is
to move current through a component, it occurs when electrons
travelling along the wire collides with the atoms of the wire.
To choose a factor to measure I will make a list of the factors I
could investigate and decide which one is best for me to investigate.
1. Material - The type of material will effect the type of atom in the
wire, which consequently dictates the number of free electrons.
I will not investigate this factor because, although recording results
would be simple, no graph could be drawn, from which a connection
could be made.
2. Temperature - If the wire is heated the atoms will have an increase
in energy, This will cause more collisions.
I wont investigate this factor either as it would be extremely hard to
carry this out as a fair test, as it would be very difficult to
control the temperature of the wire.
3. Wire width- if the wire width is increases then there will be more
room for the free electrons to go through the wire. I will not
investigate this factor either, as the graphs I would be able to draw
up would be uninteresting and irrelevant.
4. Wire Length- if the length of the wire increases so will the
distance the electrons will have to travel, so there will be more
collisions. I have chosen to investigate this factor because the
graphs I will be able to draw from good results should be interesting,
and to gain good results should be quite simple.
Prediction
We know that resistance is proportional to the length of a wire using
the formula:
Resistance = Resistivity X Length
Cross sectional Area
I predict that if the length increases then the resistance will also
increase.
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