Resistance of a Wire
We are trying to find out what affects the resistance of a wire.
Resistance is the slowing down of electric flow (flow of electrons)
due to metal ions. The equation to measure resistance is:
Resistance = Voltage ÷ Current
R = V / I
Resistance is measures in 'volts per amps' or, more commonly, 'Ohms'
(Ω).
There are a few things that affect resistance. I think these are:
¶ Length of wire
¶ Diameter of wire
¶ Material/type of wire
¶ Temperature
I am going to try and find out how the diameter of the wire affects
the resistance of the wire. I will do some tests find out how the
diameter affects the resistance. I think that if I increase the
diameter the resistance will decrease.
Method
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1. First I will set up a circuit with a power pack, voltmeter, ammeter
and a space for a 1metre wire.
2. Then I will get a metre ruler and measure 1 metre of the first size
of wire and cut it with wire cutters.
3. I will stick the wire to the metre ruler with two pieces of sticky
tape 2cm away from either end to keep the wire straight.
4. I will then put the wire (attached to the ruler) in the gap in the
circuit and attach it to the circuit.
5. After turning the power pack on, I will record the numbers on the
voltmeter and ammeter.
6. I will then repeat steps 2 to 5 with 4 other different Standard
Wire Gauge sizes of wires.
7. Next I will repeat the whole experiment another few times.
I have chosen this method because it is quick, practical and easy to
do and will produce accurate and reliable results. I think it is the
best because it is the easiest one to do and you don't need that much
equipment but still get good results.
Apparatus
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one. I will use the same standard each time for judging when the X has
every step by another 1 cm2. At the same time I will be counting the
3. Place the end of the ruler at one edge of the crater and measure to
Repeated steps 2-5 above using the radii of 14.3 cm, 14.6 cm, 14.9 cm, and 15.2cm respectively.
2. Take out a triple beam balance, graduated cylinder, long pipette, beaker, a wooden dowel, calculator and a centimeter ruler.
every number. Then move your ruler down to the bottom. No, put it across the bottom. Now
1 and then divide the result by 10, in order to eliminate as much time
After the calculation we needed to convert pc to meters so we used the calculation factor of 1pc=3*10^16m
3. It doesn’t even take much space on your shelf :)) It doesn’t cause any inconveniences.
will use 2x2, 3x3, 4x4, 5x5, 6x6 and a 7x7 grid. I will do this to
9.) Timer – I chose this as it is very precise (it measures to 2
F This was repeated 10 times in all, each time, an extra wire of exact
14. Make sure that you put your reeds back in the reed holder when you are finished using them, so you are sure to avoid breakage.
3. The two most widely spaced dots were marked on the tape - the zero