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

Investigating how resistance depends on shape

Extracts from this document...

Introduction

Emma Loyd 11KM


Investigating how resistance depends on shapeimage00.png

There are many factors involved in this experiment, which include the following:

image01.pngThe length of resistance putty

image01.pngThe width of resistance putty

image01.pngThe voltage running through the putty

image01.pngThe position of the variable resistor

image01.pngThe shape of the putty

The factors, which I am going to investigate, are:

image01.pngThe resistance of the putty, when at different lengths

I predict that the shorter I cut the putty, the lower the resistance will be. The longer the length of putty, the higher the resistance will be. I think that this is because there are more atoms in a larger cylinder of putty than there are in a smaller piece of putty, this therefore means that in the larger cylinder of putty there is more chance that the electrons will collide with one of the atoms, therefore there is more resistance.

Scientifically explained:

Conductors have lower resistance when they are shorter because the electrons have a shorter distance to travel so more energy is conserved since there are fewer collisions, and the current is higher.

...read more.

Middle

image01.pngOnce the equipment is set up correctly, make a record of a reading of the resistance, and then repeat this reading twice, this is to make sure that none of your readings have been taken incorrectly, and that it is the correct sized cylinder, you could also measure the weight of the putty.

image01.pngCut the putty to a length of 27cm and re-measure the diameter to make sure that it is the same diameter as used for the last reading

image01.pngRepeat the last bullet point for the other five different lengths (25cm, 20cm, 15cm, 10cm, 5cm)

The safety procedures to be considered during this experiment are:

image01.pngDon’t touch the circuit with wet hands

image01.pngMake sure that there aren’t any gaps in the insulating plastic, before connecting to a power supply.

image01.pngDon’t run a too high voltage through the circuit, until you are sure that it is safe to do so.

image01.pngDo not override the power supply.

...read more.

Conclusion

I think that my results have given me enough evidence to show that my prediction is correct. My results are very good and have no mistakes within them.

I think that this was a suitable procedure to use to investigate resistance, as it showed what I needed to know very clearly, but if I could re-do this experiment another time, I would take more sets of results, in order to be more accurate with my results. I think that therefore, I can rely on my results answer my earlier question of ‘how does resistance depend on shape’ thoroughly and correctly.

...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.

    Thus the resistance decreases. Let me explain this theory using energy bands: Semiconductors have a narrow forbidden band between the valence and conduction bands. At normal temperature, the thermal energy of some valenc electrons, is sufficient for them to reach the conduction band, where they may become conduction electrons.

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

    2 4.42 4.83 4.97 5.31 5.59 3 4.31 4.65 5.20 5.36 5.57 4 4.24 4.62 5.11 5.39 5.56 5 4.27 4.77 5.03 5.32 5.59 6 4.38 4.80 5.09 5.38 5.56 7 4.40 4.72 5.17 5.37

  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. Characteristics of Ohmic and Non Ohmic Conductors.

    When this happens, the resistance increases and so the amount of current flowing increases but at a slower rate as we can denote from the curve. Metals are non ohmic conductors at high temperatures. This is shown in the next diagram as to why this it is like this. ?

  1. Investigating how temperature affects the resistance in a wire

    30?C, 40?C, 50?C, 60?C, 70?C, 80?C, 90?C, 100?C consecutively by adding an appropriate amount of hot water from the kettle. 7. Disconnect the multi-meter from 'apparatus A', empty the water in the measuring beaker and pack up the rest of the equipment (*note must be done in that order). 8.

  2. To find which of the circuits, shown below, are most suitable to measure a ...

    I investigated further by conducting more calculations for circuit One, to find out at which value it would be the same as Circuit Two (40? off labelled resistance value): Circuit One Value specified on Resistor (?) Value Obtained due to calculations (?)

  1. Find The Internal Resistance Of A Power Supply

    The greater internal resistance occurs since the temperature of the power pack (the components inside the power pack that transforms the mains voltage) increases because in the metal components there are positive ions which collide with electrons that are flowing around the circuit. As a result the electrons loose energy.

  2. Coursework To Find The Internal Resistance Of A PowerSupply

    The greater internal resistance occurs since the temperature of the power pack (the components inside the power pack that transforms the mains voltage) increases because in the metal components there are positive ions which collide with electrons that are flowing around the circuit. As a result the electrons loose energy.

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