So the experiment will have three sets of current, these sets will also include length values of 1cm through to 10 cm. The resistance is given by the following formula 1: I will place one crocodile clip at 0cm on the wire and the other at 5cm to complete the circuit.
To measure this you cannot just put a measuring device on the graphite and measure the resistivity. Five trials were taken for five different lengths to obtain a reliable, wide range of data. The actual range is 1. The variables I will control will be the type of wire resistivity and the cross-sectional area of the wire.
Here is a model illustrating resistance in a metal: Variables Safety I will ensure experimental safety by confirming that all the wires are connected properly and that none of the insulation on the wires is worn.
Five trials were taken for five different lengths to obtain a reliable, wide range of data. Using the same piece of wire throughout the experiment meant its temperature rose slightly over time, which may have affected my results.
A variable DC power pack. A longer ruler or a measuring tape could be used to avoid these kind of easily avoidable errors. The end of the wire was held at zero centimetres and the other end was measured and cut.
As it can be seen from the total uncertainty calculation, the experimentally deduced value of the diameter of the Nichrome wire was accurate to a large extent. I think that the range of my results was sufficient enough for me to draw a valid conclusion about how the length of the wire affected the resistance.
I found that because there were so many equations to get to the actual resistivity, there was more chance for human error.
Repeat step 8 Thickness of the wire, the thicker the wire I think will add more resistance because there are more metal ions in the wire to have collisions with electrons causing more resistance in the wire.
This would have prevented the area of the wire from remaining constant and would have affected my results. I will stand up during the investigation to ensure that I do not injure myself if something breaks.
In this experiment, the students were given a spool of Nichrome wire to determine its diameter. For example, if a 2AWG wire requires a 10mm diameter, most manufacturers will label even a 9.
To support my prediction and conclusion, I could do further experiments. A possible workaround both these problems can be to use a thread to run along the Nichrome wire and then measure the thread to determine the length of the Nichrome wire used.
The uncertainty, however small, cannot be ignored and they must be explored so that if possible, they can be avoided in the future.
The power supply was set to 2 volts and the current and voltage was measured using the voltmeter and ammeter respectively. V will be altered using the crocodile clips to change the distance selected of the wire. However, due to my line of enquiry, I will only change the length of the wire.
Therefore, the most accurate way would be use a micrometer screw gauge to measure the diameter of the wire at different locations and then match the experimental value obtained from this experiment against the average of the micrometer readings.
Tape a piece of wire Swg 22 tightly to a metre Investigation of resistivity of nichrome wire essay 3. Get Full Essay Get access to this section to get all help you need with your essay and educational issues. This was because I could plot a graph and show the general trend.
There are a few data points that are farther away from the line of best fit than the others, but they are still consistent with the general trend. Another problem was that the wire was often crooked at some places and straightening it could have caused it to crack so they were not completely straightened.
A longer wire would have more resistance then that which is shorter. The room temperature — since if the temperature is increased the particles in the wire will move faster and this would not allow the experiment to be fair. So in the final experiment I will leave the wire to cool for 30seconds between each change in distance.
When choosing the wire I used a Micrometer to ensure that I had the correct thickness of wire and that it was reasonably accurate thickness of wire.
These are the Material of the wire. In fact, the wires were looped around several bobs and the distance between the bobs were measured to give an accurate estimate of the length of the wire.
Resistivity as calculated from the graph:Investigating Resistance of a Wire Essay examples - Investigating Resistance of a Wire INTRODUCTION This investigation is about find the resistance of a wire.
Resistance is the slow-down of the flow of an electric current around a circuit so that energy is required to push the charged particles around the circuit.
Investigation To Measure The Resistivity Of Graphite Essay Sample. Aim. The aim of the experiment is to find out the resistivity of graphite. The resistance which is measured in ohms of a resistor is applied with three basic elements. A Physics Investigation of the Resistance: Of A Piece of Wire?
words - 9 pages Aim:The aim of this investigation is to investigate and discover if the length of a piece of metal wire effects its resistance when electricity is passed through ifongchenphoto.comtionBefore I make a prediction I shall explain about atoms, free electrons, electricity and ifongchenphoto.comicity travels through a.
To investigate what affects the resistance of a wire. VARIABLES: Need essay sample on Investigation of the resistance of a. Read this essay on Resistivity of Nichrome. Come browse our large digital warehouse of free sample essays.
Investigation of the Resistance of a Wire The Nichrome wire has electrical resistivity of ρe = 10 -6 Ωm, thermal conductivity of k = 25 Wm-1K-1, and surface emissivity of ε = a. Assuming negligible temperature variations. It does not pass trough as easily in a thin nichrome wire of an electric fire element.
This wire has much more resistance. Energy has to be spent to force electrons through it. And heat comes off as a result.
All conductors have some resistance but: Long wires have more resistance than the short wires.Download