• 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.

    When the value of current is limited the graph is linear whereas when the value of current is not limited the graph would be a curve. The different lines that have been drawn from different light intensities prove this. This proves it is a non ohmic conductor.

  2. The varying of the resistance of nichrome wire depending on its length

    5. Record all results and turn power pack off. Results for investigation with fixed value resistor Number Current (amps) Voltage (volts) Resistance (ohms) 1 0.03 0.04 0.75 2 0.41 0.44 0.93 3 1.07 1.14 0.94 4 1.39 1.46 0.95 5 2.47 2.55 0.97 Average 0.91 Results for investigation with filament lamp Number Current (amps)

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

    I also used this test to find out how to make this test fair and so that any mistakes will not be repeated in the real experiment. In the preliminary test, I used two types of wire: The first was a copper wire and the second was a constantan.

  2. Assess the effect length on the resistance of brine soaked paper

    For this experiment - I predict that as the width increases the resistance will decrease inversely. Here are the results I collected: Width (cm) Potential difference (Volts) MAmps Amps Resistance ( ) Average 1 5 0.28 0.00028 17857 6 0.34 0.00034 17647 7 0.40 0.00040 17500 8 0.52 0.00052 15385

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

    I then split the putty into 5 different length sections measuring to: 1cm, 3cm, 5cm, 7cm and 9cm. Each section is 2cm larger than the one before it to help show clear and reliable results of the resistants. I then measured both ends of every coil to make sure the

  2. physics sensor coursework

    light intensity and my calculated value are extremely similar, with a difference of only 0.08 lux. Beside a window, V = 4.92, I = 18.57 � 10^-3 A, L = 723 lux. Using my formula: R = V/ I R = 4.92/ (18.57 � 10^-3)

  1. Characteristics of Ohmic and non-Ohmic Conductors.

    In this experiment, I will be noting the Current for the various Voltages at intervals of 0.2 V, in the same manner as I did for the previous experiment, in descending order, and then in ascending order. The average of he two will then be taken, to obtain reliable results.

  2. The electrolysis of copper from copper sulphate solution

    how to record, understand and in some cases, calculate results with set formulae. I am happy with my results because as the graph will show you, I was able to draw a best fit line very easily. I have taken three sets of results for each concentration value; the reason

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