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

An investigation to see how well carbon putty conducts electricity.

Extracts from this document...

Introduction

An investigation to see how well carbon putty conducts electricity.

Equipment:

Coins x 2

Carbon putty

Ammeter

Voltmeter

Wires

Power pack

Variable resistor

Calliper

Tile

I will perform this investigation in a safe a fair way.  I will not leave the power on unattended and I will keep all the factors the same apart from the one I decide to change.  I will change the length of the putty.

The factors I will have to keep constant are the diameter of the putty, temperature, the wires, size of coins.

Prediction and theory

I predict that the longer the putty is the more resistance it will have and therefore will not conduct the electricity as well.  This is because the putty has free moving electrons in which the electricity jumps between in order to get through it.  Having these free moving electrons lets the putty conduct the electricity.  But if the putty is longer and the diameter kept constant then there will be more free moving electrons in the putty, this mean that for the electricity to be conducted through the putty the energy has to jump between more electrons making the resistance of the putty larger.  When the length of the putty is small then there are less free moving electron which pass the electricity and therefore not as many for the electricity to jump through in order to conduct.

...read more.

Middle

Preliminary work:

This preliminary work was done before my investigation and it helped my determine what width I should use for the diameter.  For this experiment I kept everything constant but changed the width of the diameter.  These are the results from my preliminary work.

...read more.

Conclusion

My investigation proves my theory that the longer the putty is, the more resistance there will be.  The electricity took longer to jump through the free moving electrons to go through the putty.  Therefore when the putty is shorter the resistance is less as there are less free moving electrons for the electricity to pass through.  You can see this is true from all my graphs.

Evaluation:

As my results were accurate and proved my theory there is not much that could be done to improve it.  However, I could investigate the resistance of the lengths in between the ones that I did and I should also use some kind of mechanism so that I would know that the diameter was the same throughout the putty.  This would make the results more reliable although my results were reliable enough to prove my prediction.  

I think that I worked well on my investigation and completed it within the time specified.  I worked carefully and safely.

To investigate further in this work I could experiment with temperature or changing another factor.  This would be interesting to see how all the factors would effect the resistance of the carbon putty.

...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. The aim of my investigation is to determine the specific heat capacity of aluminium.

    This may make my results nearer the book values. Oil was placed in the hole in the aluminium block, which contained the thermometer, to speed up convection current between the block and the thermometer so that the heat is transferred quicker. Convection occurs quicker in oil due to the fact that the particles in the oil are closer together

  2. Physics - How Electric Eels Generate and Use Electricity.

    As an alternative of having a positive outside and a negative inside, the cell momentarily has a volt of 0.085 voltage difference across the convoluted side, and likewise an oriented charge average of 0.065 volts on the smooth side. These charges are all essentially stacked in series so that the

  1. Does the length of a conduction putty affect its resistance?

    Another factor that makes Digital multi-meters better than Moving coil meters is that the Digital multi-meter's displays are digital, whilst the Moving coil meters have to be read off the scale by the eye, which is far less accurate. Using the Digital multi-meters makes my results far more accurate and

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

    13.24 40.0 2.30 0.14 16.43 50.0 2.45 0.10 24.50 60.0 2.50 0.08 31.25 70.0 2.55 0.08 31.88 80.0 2.60 0.07 37.14 90.0 2.75 0.06 45.84 Mean Average Resistance Calculations: For 10cm length: 4.57 + 4.86 = 9.43 �2= 4.715 rounded up to 2 d.p--> 4.72 ?

  1. A2 Viscosity investigation

    The micrometer measures with a sensitivity of +or- 0.1mm. to use this accurately ensure that the ball bearing lays in the centre of the micrometer to ensure it doesn't move so you can obtain an accurate reading also ensure that the micrometer is correctly set to 0 before you start your measurements.

  2. Investigating how temperature affects the resistance in a wire

    can drop quicker than at lower temperatures (where the temperature difference is less). To represent this opening for inaccuracy, I have used x-axis error bars on the results with an error amount of 5% of the value (temperature for that result).

  1. An Investigation into how electrons move

    We discovered that the crystal moved extremely slowly. We then increased the voltage to 250v and found that whilst the crystal appeared to move faster at this voltage, it was still very slow. We tried using different quantities of ammonia solution to see if this would affect the results.

  2. Investigating Electricity.

    circuit, it should look something similar to the example below: Example: In the experiment I will be measuring the voltage and the current; I will vary the voltage from 0 volts to 10 volts and take the current reading from the ammeter. Some devices let a large current through them.

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