• 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...


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


                 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:


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.

















































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.


  • 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.


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.


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

    ensure that results are more accurate and that no short-circuiting will occur. All of the variables above must be kept the same as they all will affect the resistance of the wire. Independent variable * The length of the wire, I will do this by changing the length of the wire using the crocodile clips.

  2. Characteristics of Ohmic and non-Ohmic Conductors.

    Voltage Current Calculated Resistance 0.2 0.06 3.33 0.4 0.12 3.33 0.6 0.18 3.33 For both wires, since all the readings for resistance are constant, and the graph is a straight line passing through the origin, we can say that the values are directly proportional.

  1. physics sensor coursework

    �100 Error min = 4.12% At 900 lux: Max value = Max V/ Min I Max value = (4.16 + 0.005)/ [(18.73 - 0.005) �10^-3] Max value = 222.43 ? Min value = Min V/ Max I Min value = (3.89 - 0.005)/ [(18.78 + 0.005)

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

    Repeat twice more, and then move wires up to the next distance going up in 10cm. 6. Repeat step 4 three times. 7. Continue increasing the length at 10cm intervals, making sure that at each number the experiment is repeated three times.

  1. Physics Coursework - Factors that affect the resistance of brine-soaked paper

    10 5.00 0.94 5.319 3 5 5.01 1.87 2.679 6 5.01 1.60 3.131 7 5.00 1.32 3.787 8 5.01 1.20 4.175 9 5.00 1.07 4.672 10 5.02 0.96 5.229 Average! 5 5.08 1.73 2.94 6 5.01 1.56 3.22 7 5.01 1.25 4.01 8 5.01 1.21 4.13 9 5.02 1.07 4.67

  2. Investigate how the resistance changes when the length changes of a peice of putty

    In order to control the current, you need a rheostat. The higher the heat, the more collisions occur. If there are more collisions, the slower it takes for the electricity to go through. How long it takes affects the current and if it takes longer it means that there is less current.

  1. Find The Internal Resistance Of A Power Supply

    All readings were taken in succession, starting with two volts and finishing on twelve volts. During this time the power supply was continuously running which meant that the mechanism inside could have heated up as the experiment proceeded. This could have resulted in the internal resistance of the power supply to rise slightly.

  2. Energy Efficiency Experiments

    Electric power plant efficiency ? is defined as the ratio between the useful electricity output from the generating unit, in a specific time and the energy value of the energy source supplied to the unit in the same time period.

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