• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Does the length of a conduction putty affect its resistance?

Extracts from this document...

Introduction

Physics coursework - Does the length of a conduction putty affect its resistance?

Hypothesis:

                 I predict that as the length of the conducting putty increases, its resistance will increase. This is because as the length of the conducting putty increases, the current will have to pass through more molecules of the element(s) that the conducting putty is made of. This will make it harder for the current to pass through the conducting putty and so the electrons that compose the current will collide with more of the elements that make up the conducting putty. This causes friction between the electrons and the molecules and so heat is dissipated, which makes the circuit less efficient. This means that the putty is acting restricting the flow of electrons around the circuit more efficiently as its length increases, hence it is a better resistor.

        In order to calculate the resistance of the wire, I plan to use Ohm's Law, the formula for this law being:

V=IR

When rearranged, it can be used to calculate the resistance of a substance, which I will need in my pre-testing and main experiment, to see if the resistance of the putty chances as its length decreases:

R= V/I

...read more.

Middle

5.37

0.21

25.57

4

3.49

0.14

24.93

12 

8

7.33

0.35

20.94

22.13 

6

5.34

0.24

22.25

4

3.48

0.15

23.20

8

7.04

0.52

13.54

13.86 

6

5.18

0.37

14.00

4

3.37

0.24

14.04

8

6.56

1.24

5.29

5.58 

6

4.84

0.9

5.38

4

3.03

0.5

6.06

These results prove that the putty that I am investigating is an Ohmic conductor, as even when the potential difference changes, the resistance of the putty remains constant for the same length.

Now that I have proved that the putty does conduct electricity in a constant manner, I can start the main experiment.

Apparatus:

  • 1 power pack
  • 2 thin copper sheets -these are required in order to improve the efficiency of the volume of current that flows through the putty.
  • Emery paper - this will be used to file the copper sheets and so improve their conductivity.
  • A mass of putty
  • 1 small knife
...read more.

Conclusion

The other safety precaution that I will take during this experiment is to constantly make sure that there is no water near any of the apparatus that I am using in the experiment, nor nears the mains supply. I will also make sure that there is no water on my hands for the duration of the experiment, as water conducts electricity and so if I had water on my hands I could be electrocuted.

Finally, before I eat anything, I will make sure that my hands are thoroughly washed with soap and water, in order to get rid of any traces of putty that may have come into contact with my hands during the experiment, as they could be toxic. I will follow this safety precaution even though I am wearing gloves, as small tears could occur in the gloves during the course of the experiment.

Results:

On the following pages are the results that I obtained from my experiment. The 4th page of tables shows the average results that I obtained and hence used to plot the graphs that I have drawn in Analysis.

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Electrical & Thermal Physics essays

  1. Characteristics of Ohmic and non-Ohmic Conductors.

    (Instead of doubling to 18.4 mA) Voltage range (volts) Current Range (mA) Gradient 0.1-0.2 6.6-9.2 0.026 0.3-0.4 10.7-12.1 0.014 0.5-0.6 13.5-14.7 0.012 0.7-0.8 16.0-17.0 0.010 0.9-1.0 18.1-19.0 0.009 This graph shows a complete curve. At the beginning of the graph the current is increasing at a high rate (the voltage is also increase but not at the same rate as the current).

  2. Practical Assessment for Physics: Investigating the Resistance of Conducting Putty.

    With my results I created an average voltage reading for each length of putty by adding their ten readings and dividing it by ten. I also did the same to create an average of the current for each length of putty.

  1. Investigating the effect of 'length' on the resistance of a wire

    In different conductors the ease of flow of the electrons is different and so the conductors have different resistance. The amount of current flowing through a circuit can be controlled by changing the resistance of the circuit. This can be done with a resistor which is a component designed to have a specific resistance.

  2. Characteristics of Ohmic and Non Ohmic Conductors.

    Some other factors also affect the ohmic conductors. There are normally two types of conductors. The two types of conductors are ohmic and non ohmic. Ohmic Conductors such as a pure metal such as copper or tungsten obey Ohm's Law given that the temperature and pressure at kept low and constant.

  1. physics sensor coursework

    There is a degree of error in graph shown all graphs, but error displayed in graph below is due to averaging and to some extent, the resolution of measuring equipment (e.g.

  2. How does the mass of copper plated in the electrolysis of copper sulphate solution ...

    Also I can plot a graph of my first experiment and then my second experiment so I can compare how accurate they are and make decisions of which results are anomalies. Analysis I am going to present my results on two graphs.

  1. The electrolysis of copper from copper sulphate solution

    However, if any spills make their way on to my skin then I would be sure to wash it off with water at the nearest tap. 6. I must make sure not to run to get anything or to hurry to wash off any solution, he risks of any

  2. Energy Efficiency Experiments

    The efficiency of experiment 4 was 3790 % which is a substantial amount compared to the other experiments. Maximum productivity was achieved with minimal energy wasted as the wasted energy output was -1107 J. Coal is considerably very cheap. You burn the coals and use it to heat up things as a fire.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work