Then roll the carbon putty to get a different cross section area, and then do the experiment. By looking at the averaged resistances, it is possible to see that the resistance increases as the length increases.
There are possible sources of error that might have led to inconsistent results, such as a kink in the wire. Conducting putty 2p coins and crocodile clips Wires Ohmmeter Collecting the data In collecting the data, we use plastic glove as this carbon putty is messy and afterwards it was a wise thing to do to wash our hands as this material is toxic if swallowed.
This scientific knowledge helped me to understand what would happen, allowing me to make my prediction below, and also write my detailed strategy. The resistance of most of the alloys, e. Even though wire was not being used in the experiment, resistance putty conducts electricity and so the same example can apply.
We then need to cut off 2 cm from the carbon putty each time, and take another reading. I think my method could have been improved to produce results that were even more consistent. This means its resistance is less. These experiments would still involve changing just one variable, but instead of having a constant width of 2cm in diameter, the constant width could be 5cm in diameter instead.
It conducts in one direction only and is a non-ohmic conductor. In this case, it will be resistance, owing to the change of conditions in the circuit. It was also very difficult to get a good constant contact between the coins and putty.
Therefore, there is no need to think of another way to connect the resistance putty into the circuit. This will be done for several different diameters. This could be why the ammeter and voltmeter readings fluctuated quite often.
If the graph was a curve with the highest point of resistance with the shortest length, and the lowest point of resistance with the highest length, then the results would show that they are inversely proportional i. Discussion Overall, my results are very consistent with my predictions.
The multimeter creates its own circuit, and can read the resistance through the wire without needing to work calculations between the relationship of voltage and current. I have done a preliminary test using a similar method below but I have measured the current that goes across the conductor and then calculating the resistance from the data I have collected.
From then on, the graph starts to curve. By looking at the table of results, it is possible to see that I managed to get readings for all of the different lengths and with different number of cells.
In this experiment I keep the diameter to be constant at 2. I can confirm this prediction because the scientific theory written states the following.
However, I think that unless I had specialist equipment the results would be distorted because the wire would eventually get very hot. So, I have decided to amend my range from 20cm to 6 cm, to 16cm to 2 cm. This is because the resistance is increasing at a slower rate than previously but the length is increasing at the same rate.
For example, I could use different types of wire instead of using only nichrome. For example, electrons travelling along a really long piece of resistance putty will encounter more atoms from the putty than a really short one, so the longer the wire, the more resistance.To Investigate The Factors Which May Affect The Resistance Of Resistance Putty Essay Sample.
Planning. There are three different factors, which may affect the resistance of resistance putty. To Investigate The Factors Which May Affect The Resistance Of Resistance Putty Essay Sample. Planning. There are three different factors, which may affect the resistance of resistance putty.
These three factors are temperature, length and thickness. Investigating the resistance of resistance wire. Problem: “Investigate one of the factors that effects the resistance of resistance wire” Normal wire is used for conducting electricity; the best wire is the one that gives out the same amount of electricity that was put in.
Apr 19, · The free electrons keep bumping into atoms. A wire's resistance depends on four main factors: Resistivity; Length of the wire; Cross-sectional area; Temperature of the wire; I will investigate how the length of the wire affects the resistance.
I have done a preliminary experiment to help me decide the best way to do my wsimarketing4theweb.coms: How the Length of a Wire Affects its Resistance Words | 6 Pages. How the Length of a Wire Affects Its Resistance In my physics coursework I am going to investigate the effect of the length of a wire on its resistance.
Resistance is the measure of how easy it is for current to flow through a wire. This would prove my prediction and hypothesis to be correct, as it states that the putty will have lower resistance when the length is shorter rather than longer or the resistance of a conductor is directly proportional to its length; due to factors such as loss of energy to heat, higher rate of collisions etc.Download