• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11

Find out the relationship between resistance and conductive putty, and to see how length of putty affects this relationship.

Extracts from this document...

Introduction


Aim:image00.png

The aim of this investigation is to find out the relationship between resistance and conductive putty, and to see how length of putty affects this relationship.

The Experiment:

Conductive putty is specially designed to be a conductor; this is achieved by adding carbon black. This can easily be used to prove the concept of resistivity because it is malleable and so the cross-sectional area, length and shape can easily be changed.

This experiment will show the effects on resistance in a circuit, as the length of putty decreases.

I will be using 30cm of putty, and decreasing it by 5cm each time.

First the voltage of the battery will be taken using a voltmeter, and this will be recorded at the start of the experiment. Then a circuit will be constructed containing the battery, the ammeter and putty. See diagram. For each different length of putty, a reading will be recorded from the ammeter and when the practical has been completed, I will work out the resistance using the formula R=VI. From those results I will draw a graph and then evaluate and conclude my experiment.


Diagram:


Constants:image01.png

My constants include the weight of my putty – I am going to start each experiment with 50g of putty.

...read more.

Middle

I have calculated the resistance using the formula: R=V/I. Resistance is measured in ohms and the unit uses the symbol Ω.

Experiment 1 – battery voltage = 6.12V:

Length of putty in cm

Amps in A

Resistance in Ω  

30

0.06

102

25

0.08

76.5

20

0.10

61.2

15

0.13

47.08

10

o.14

43.71

5

0.25

24.48

Experiment 2 – battery voltage = 6.03V:

Length of putty in cm

Amps in A

Resistance in Ω  

30

0.05

120.6

25

0.06

100.5

20

0.08

75.37

15

0.11

54.81

10

0.15

40.2

5

0.27

22.33

...read more.

Conclusion

If this experiment was going to be redone, then I think I might use a new battery for each experiment, and record the voltage as constant for all experiments. Also I would maybe use a different method to connect the wires to the putty, like maybe sticking the wires directly and vertically into the ends of the putty. Another thing to do would be to use temperature or even cross-sectional area as a variable alongside length, and to do a series of experiments involving increasing the length while decreasing the cross-sectional area, and vice versa.


Conclusion:

I think this experiment was a success in that it proved the theory that resistance is lower with shorter lengths of conductor and my hypothesis declares that as the electrons have a shorter distance to travel if the length is shorter, there are fewer collisions and less energy is lost to heat unlike in a longer length of conductor, so the putty will have lower resistance. Therefore my hypothesis was correct and I have successfully concluded my experiment proving that resistance is directly proportional to the length of conductor.

...read more.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism 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 GCSE Electricity and Magnetism essays

  1. Marked by a teacher

    An Investigation To See How Resistance Can Be Changed By Variables.

    4 star(s)

    * Voltage meter measures the output data. (make sure this in parallel to the circuit or all the readings will be the same) * Amp. Meter- to insure impute data is all of the same current level. Readings and number of readings; I will be taking around three result for

  2. Marked by a teacher

    An Investigation Into The Resistance Of Conductive Putty

    3 star(s)

    What factors I am going to keep the same In the experiment I am going to keep a few things the same such as the diameter of the putty, the amount of cells and all of the safety procedures. Repeats of the experiment I plan to make a repeat the

  1. Conducting Putty

    The putty is made out of carbon, which is known as a semi-conductor and does not react. It would take longer for the currant to pass through the putty. When electrons have a shorter distance to flow through, there are less collisions between the electrons as seen in smaller lengths of putty.

  2. To find out what happens to the efficiency of a motor as I change ...

    We made sure that the sting was taut each time, because if it had been slack, the motor spindle would have had to complete more rotations in order to wind the string and lift the weight. What may have caused anomalous results?

  1. To investigate how the length (mm) and the cross-sectional (mm2) area of a wire ...

    Now that I have completed evaluating my experiment and its results, I will propose an extension to my investigation that will allow me to test the relationship between resistance and other variables such as temperature, density, etc. This extension should enable me to come up with a complete picture of

  2. Resistance of Carbon Putty.

    I used a power pack set on two volts connected the putty as shown in the diagram, varied the length from 10.5 to 11.5 cm keeping the diameter constant at 2.2 cm. I used the ammeter setting of a multimeter to measure the potential differences passing through the conductive putty.

  1. To investigate whether the surface area or the lengths of the carbon putty will ...

    is said that R = V and therefore we are I measuring the current by varying the length of the carbon putty. We were using a 3 Volts cell and an ammeter to measure the potential differences passing through the conductor putty.

  2. What is the relationship between the length of an electrically conductive metal wire, and ...

    Current is thus also a dependent variable. The other variables will be kept (or assumed to be) constant. Materials Used - Metal wire of length greater than a meter. - Direct power supply - Voltmeter (�0.02 volts) - Ammeter (�0.02 Amperes) - Ruler (�0.001 meters) - Scotch tape - 4 alligator clips - 5 connecting wires Method 1.

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