• 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
  12. 12
    12
  13. 13
    13

Find out whether a longer wire or a shorter wire will have more or less current flowing through the wires.

Extracts from this document...

Introduction

Name: Amritpal Singh Sahota                                  Candidate number: 9723

image00.png

image04.png

WIRES INVESTIGATION

AIM

In this investigation, I am trying to find out whether a longer wire or a shorter wire will have more or less current flowing through the wires.

VARIABLES

  1. Thickness Of The Wire

Resistance can be affected by the different thickness of wires. The thicker the wire, then there is less atom to block the path of the electrons and this means that there will be less resistance. However if the wire is thinner then there will be the same number of atoms but fewer electrons will be able to pass through the wire.

Therefore this means that there will be an increase in resistance. The reason due to this is that a thicker wire has more space around the atoms to allow electrons to pass. But in a thinner wire it will be the complete opposite.

This is for a Thick wire                   This is for a Thin wireimage08.pngimage05.png

image01.pngimage11.png

image01.png

image01.pngimage19.png

image01.pngimage02.pngimage01.pngimage01.png

image03.png

  1. Length Of The Wire.

The length of the wire is a variable, in which when a longer wire is present the resistance is higher. This is because there are more atoms present, which are in the way of the electrons. They are evenly spread out. However if a shorter wire is present the wire has fewer atoms, which means that the electrons can move more freely.

                                                                 Long Wireimage01.pngimage01.pngimage01.pngimage01.pngimage01.png

image01.pngimage01.pngimage06.png

                                Short Wire              image05.png

  1. Temperature

Temperature is also a variable for resistance. When a filament lamp is turned on, the heating of the current causes the temperature of the filament lamp to rise very rapidly.

...read more.

Middle

image01.pngimage01.pngimage01.png

image05.png

PREDICTION

In my prediction I predict that the longer the wire the higher the resistance. The current will also be lower. However the lower the resistance the higher the current will be present in the wire. I think this because the current will have to flow through a longer distance and therefore it causes a higher rate of resistance. This is due to the force being pushed and travelled a longer way. If I double the length of the wire, the resistance will also double, which makes the current halve, also that if the current doubles, the resistance haves.

HYPOTHESIS

The reason why I think this will happen is because in the wire the electrons will be able to get passed more freely. This is shown in the diagram below.

image18.png

image01.pngimage01.pngimage01.pngimage01.pngimage01.png

        Electrons                        Atoms

(I) Current is what flows on a wire or a conductor like water flowing down a river. Current flows from points of high voltage to points of low voltage on the surface of a conductor. Current is measured in (A) Amperes or Amps.

(V) Voltage is the difference in electrical potential between two points in a circuit. It’s the push or pressure behind current flow and through a circuit, and is measured in volts (V).

(R) Resistance determines how much current will flow through a component. Resistors are used to control voltage and current levels. A very high resistor allows a small amount of flow. Resistance is measured in ohms. As the resistance is increased so will the current.

                  V

                                  I

...read more.

Conclusion

I think that the results I had taken was not enough to say what I found was true, because if I had taken the length into more consideration for e.g. going up in 5’s, I would have gathered more and precise results. I also think that considering that I done this experiment in year 9 we could have thought, that we would achieve more precise results if I had gone up in 5’s.

From this I think I could have got even more precise results. The anomalous results that I found was on graph’s 4 - 10 the reason why I think this is because of the variables that are the thickness of the wire, the materials of the wire, the length o the wire and the temperature. I think that I could say that my method is reliable and that someone off the street can follow my method.

In order to extend this work I could have carried out the same experiment but change the lengths of the wires from 10, 20, 30- 100cms. To 5, 10, 15, 20-100cms (so basically increasing in 5cm at each interval). I could also improve this and extend this by using different thickness of wires. Also by using different metal materials. This is because different metals are either poor conductors or good conductors. On the whole I would consider that my experiment was good enough to which a conclusion good be drawn.

BIBLIOGRAPHY

  • PHYSICS TEXTBOOK
  • Author: Graham Booth
  • THE ESSENTIALS OF GCSE PHYSICS
  • Lonsdale Science Revision Guide
  • Author: Mary James
  • GCSE BITESIZE WEBSITE
  • www.bbc.co.uk/bitesize
  • COLLINS STUDY & REVISION GUIDE

...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. Internal resistance investigation - I will conduct the following investigation with the aim to ...

    I noticed straight away as I was doing my experiment that as the volts increased, the amps decreased and this remained consistent throughout. I did not need to make any changes or modifications to my method during the experiment as following my pre-recorded method seemed to work just as I had planned.

  2. resistivity if a nichrome wire

    I will ensure that there are no breakages in the insulation of the circuit wire. 5. When choosing the electrical appliances, for example the ammeter or voltmeter, I will make sure that it has label on it, which approves that it has been constructed in accordance with nationally-accepted electrical standards.

  1. Investigation into the resistance of a filament lamp.

    we get: ?R ?R1. ?T ?R = (constant) R1?T Here constant = a ?R = a R1?T Where a = temperature coefficient As ?R = R2 - R1 and ?T = T2 -T1 We get R2 - R1 = ?R1 (T2 - T1)

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

    If the resistivity of a material is known, the resistance of a given length of material of known area of cross-section can be calculated. Prediction: As shown by the behaviour of resistors, when the length of the conducting wire increases, the further the electrons have to travel and so the

  1. Characteristics of Ohmic and non-Ohmic Conductors.

    Experiment 3: In my third experiment, I will be investigating the increase in current, as the voltage increases in a thermistor. The circuit will be connected as shown in the circuit diagram above, and 10 sets of voltage and current will be noted, at intervals of 0.2 V.

  2. Investigate the current - voltage relationship for a resistor and filament lamp. To determine ...

    A resistance cannot be calculated because it is not constant. The graph for the fixed resistor produced a straight line. Which means the current - voltage relationship is proportional and it is an ohmic conductor. A resistance can be calculated because it is constant.

  1. Free essay

    Resistance of a wire

    All electrical current has energy stored as Potential energy, the voltage transferred in a circuit is measured as energy delivered by each coulomb of electricity. This is Potential difference (P.D), potential difference is the measure of voltage difference between two points within a complete circuit.

  2. Characteristics of Ohmic and Non Ohmic Conductors.

    This means that both are ohmic conductors. We can compare the conductors to be aluminium and nichrome as the two different conductors used in these cases. Nichrome will be the one from the graph on the right is deduced and the graph on the left is from Aluminium.

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