At each stage they can connect the circuit, take readings quickly and then disconnect the power supply. 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.
However, this would then lose its value as an open investigation. The amount of guidance will depend greatly upon the teaching group. Discussion Overall, my results are very consistent with my predictions.
In either case, different wires should be made of the same material. This experiment was safety-checked in August This confirms the first part of my prediction: This discharges the cell rapidly and can make it explode.
I will place one crocodile clip at 0cm on the wire and the other at 5cm to complete the circuit. Below is a table illustrating the effect of changing the variables see Table 2: Again, I will record the voltmeter and ammeter readings and turn off the power pack.
For this reason, it is important to keep the current very low - copper wire is effectively a short. To support my prediction and conclusion, I could do further experiments.
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. Graph Graphing these results shows a nearly straight line, illustrating a strong positive correlation between length and resistance, which is consistent with my prediction.
Most of the data points were on, or very close to, the line of best fit. Students should be encouraged to adjust the voltage to keep currents small with every set of readings.
However, using new pieces of wire each time would have been too impractical and time-consuming in the context of this lesson. Apparatus and materials Cells, 1. This will reduce the chance of false readings and will cancel out any anomalous results. Variables There are different variables that can be changed in this experiment; these are the independent variable.
Students will find it easier to measure at a prescribed length if they tape the wire to a metre rule with insulating tape and make connections with flying leads rather than crocodile clips.
I could also consider using different cross-sectional areas of wires or even change the temperature of the wires deliberately and see how manipulating these variables affect the resistance of the wire.
Selection of reels of Eureka wire also known as Constantan or Contra of different gauges, e. This was because I could plot a graph and show the general trend.
Teaching notes 1 Use fine gauge wires. However, due to my line of enquiry, I will only change the length of the wire. I will then turn the power pack on and record what voltmeter and ammeter readings.Resistance in a Wire Coursework In this investigation we are trying to look for resistance in a piece of wire, a more accurate method of measurement, and take a much wider range of readings, and more readings so that a more accurate average can be taken.
I would also investigate other factors, such as temperature, voltage and current, and. Mar 15, · Im doing my resistance of a wire coursework and ive done all of it apart from the last bit where i have to describe how the experiment testing the resistan.
GCSE Physics Coursework - Resistance of a Wire Coursework Resistance of a Wire Task To investigate how the resistance of a wire is affected by the length of the wire. Observe changes to the equation and wire as you play with the resistivity, length, and area sliders.
Sample Learning Goals Predict how changing each variable will affect the resistance. The resistance of a wire is given by the equation: R = ρ x l/A Where R is resistance, ρ (pronounced 'rho') is the resistivity of the wire, l is length and A is its cross-sectional area.
The gradient of each graph will give you the quantity ρ /A. Apr 19, · An investigation into the resistance of a wire. Free GCSE physics coursework essay. MORE.
Sign In Join. 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.