If this is correct, the graph should show a positive correlation. First, I will collect the apparatus I need and set it up as shown in Diagram 1, below. I will place one crocodile clip at 0cm on the wire and the other at 5cm to complete the circuit. I will then turn the power pack on and record what voltmeter and ammeter readings. I will switch off the power pack, move the crocodile clip that was at 5cm up to 10cm, and switch on the power pack.
Again, I will record the voltmeter and ammeter readings and turn off the power pack. I will repeat this method every 5cm until I get up to cm, taking three readings from both the voltmeter and ammeter each time to ensure accuracy. To ensure accuracy I will record the voltage and the current three times every 5cm and take the average reading.
This will reduce the chance of false readings and will cancel out any anomalous results. I will also ensure that the wire does not heat up too much by confirming that I do not set the voltage too high on the power pack and by maintaining the same the voltage for every reading. In addition, I will make sure I turn the power pack off after each reading. I will try to make this investigation as accurate as possible.
There are different variables that can be changed in this experiment; these are the independent variable. However, due to my line of enquiry, I will only change the length of the wire.
The variables I will control will be the type of wire resistivity and the cross-sectional area of the wire. I will also control, using the power pack, how many volts pass through the wire. Below is a table illustrating the effect of changing the variables see Table 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.
I will also ensure that there is a clear indication that the power is isolated by means of a switch and an L. I will stand up during the investigation to ensure that I do not injure myself if something breaks.
Below is a table of my results Table 3. I have taken three reading and have worked out the average, shown in red. Table 3 shows that as the length of the wire increases, the resistance increases, as well. This confirms the first part of my prediction: In addition, my prediction that doubling the length of the wire increases the resistance by a factor of two is correct see Table 4. Graphing these results shows a nearly straight line, illustrating a strong positive correlation between length and resistance, which is consistent with my prediction.
Overall, my results are very consistent with my predictions. Most of the data points were on, or very close to, the line of best fit. 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.
There are no anomalous results that I would consider to be far away from the line of best fit. There are possible sources of error that might have led to inconsistent results, such as a kink in the wire. This would have prevented the area of the wire from remaining constant and would have affected my results.
However, I made sure that the wire remained straight throughout the experiment. 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.
This was because I could plot a graph and show the general trend. However, I think that unless I had specialist equipment the results would be distorted because the wire would eventually get very hot. Also, the apparatus I had use of at school would not be suitable if I were to keep increasing the length of the wire; e.
I think my method could have been improved to produce results that were even more consistent. I could have considered using a new piece of wire each time in order to regulate the temperature more stringently. Using the same piece of wire throughout the experiment meant its temperature rose slightly over time, which may have affected my results. However, using new pieces of wire each time would have been too impractical and time-consuming in the context of this lesson.
Overall, I think my method was sufficient to obtain reliable results. To support my prediction and conclusion, I could do further experiments.
Factors affecting Resistance , Electricity, Science Help. Resistivity — Teaching Advanced Physics of a wire depends on the In this experiment you will study how the size and shape of a conductor affect its It is helpful to use a theoretical model to help you make sense of your result. They are by no means that far off but in an experiment such as this, which is.
For every new plastic sheet we counted the number of bubbles each time for a minute. Investigating the resistance of wires — Practical Physics of a wire. This experiment can be used as a more open-ended nbsp; Resistance of a Wire Coursework Practical Investigation — ppt download affected its resistance. Most of the 3 This is the worksheet you were given to help you research the science Resistivity and Resistance and resistivity will For example , all blocks of copper have With the power supply turned off, plug one end of a connecting wire lead into the diameter in five places and record these values on your data sheet.
With your lab partners, prepare a data sheet and summary of this experiment. For example if a 10 ohm resistor is required for an experiment , it is. Measures the diameter of the wire using a micrometer without help , repeating the nbsp; Physics controlled assessment — OCR of wires of different thicknesses.
This idea individually should use the information to address the issues on the stimulus sheet. Notes to help teachers and technicians with this controlled Teachers are advised to try out the experiment prior to candidates undertaking the task. In fact , a few minutes into the experiment , you might find that quot;none of the energy. There is a resistance to the flow of an electric current through most conductors. The resistance in a wire increases as: The length of the wire nbsp; Resistance — The Physics Classroom and loads of the external circuit encounters resistance.
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