Factors Affecting the Resistance of a Metal Wire
1. Investigate some of the factors that affect the resistance of a
metal wire. The current and voltage will be measured and then V = IR
will be used to calculate the resistance. The potential divider
circuit produced better results in the investigation into how
resistance depends on the number of identical resistors connected in
series, so this circuit will be used for this investigation, too.
Variables and Constants
2. Possible variables include the length of the wire, the diameter of
the wire, the material of the wire and the temperature. The chosen
variable is length of the wire. Because this is the chosen variable,
all of the others must be kept constant. The graph I will plot will be
the length of the wire (in cm) against the resistance (in W).
Trials
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3. Trial using a short length and a long length (10cm and 60cm) of
each of the three types of wire. The three types of wire are as
follows, copper 0.274mm, nichrome 0.274mm and nichrome 0.457mm. The
voltage and current will be measured and the resistance calculated
(using V = IR). The wire that has the largest variation between the
two measurements will be used, to provide the best results possible.
Preliminary Work
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4. Copper wire - 0.247mm diameter
Length
Current (A)
Voltage (V)
Resistance (Ω)
10cm
0.400
0.150
0.375
60cm
0.370
0.100
0.270
Nichrome wire - 0.247mm diameter
Length
Current (A)
Voltage (V)
Resistance (Ω)
10cm
0.300
0.630
2.100
60cm
0.190
1.130
5.947
Nichrome wire - 0.457mm diameter
Length
Current (A)
Voltage (V)
Resistance (Ω)
10cm
0.380
0.140
0.395
60cm
0.290
0.600
2.
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