Investigating Factors Affecting Resistance of a Wire
Aim
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Investigate what factors affect the resistance of wire, however in
this experiment I am going to monitor how the length of a wire affects
the resistance of a wire if the current is kept the same.
Method
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1) Arrange apparatus as shown in the Diagram:
2) Cut a length of wire over a meter long and sellotape to a meter
ruler.
3) Attach one positive crocodile clip to 0cm, and move the negative
up/down, stopping at;
5cm
10 cm
15 cm
20 cm
25 cm
30 cm
4) Attach the wire to the crocodile-clip leads and set voltage to 1
5) Other variables such as voltage, diameter of wire and
temperature will be kept constant.
6) Take the reading from the ammeter and record in results table.
(trying to keep the volt reading the same at all times, adjusts using
the variable resistor)
5) Repeat 3 times for each length of wire and find the average.
6) Then work out the resistance using the formula V÷I=R
(Voltage ÷ Current = Resistance)
Apparatus
Power Pack
Constantan wire
Leads
Voltmeter
Ammeter
Crocodile clips
1-meter ruler
Variable resistor
Fair test:
To make this fair test I kept some of the things constant. Variables
kept constant are the temperature (did experiment on the same day),
thickness/diameter 32 standard weight gage (swg), use same type of
material (nichrome), current (using variable resistor).
There was one thing I had to change during the experiment; this was
the length of the wire. Temperature has an affect on the experiment as
the voltage has control over the temperature. The more the temperature
increases the more the particles vibrate leading to a reduction in
output voltage although not by a huge amount this does have an affect.
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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.
-Voltmeter -Variable resistor -Power Supply -Various diameters of wire -Crocodile clips -Metre ruler [ IMAGE] Diagram:.. Secondary Source - (Obtained in A-level PHYSICS by Roger Muncaster). Page 536 - "The 'Page The electrical resistivity of a material is defined by R = L / A Where R = Resistance of some conductor(Î).
prefer to use one in which I only have to measure to half way as