• 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 wire in a circuit affect the resistance? Plan The aim of this investigation is to find out whether the resistance increases or decreases

Extracts from this document...

Introduction

Does the length of wire in a circuit affect the resistance?

Plan

The aim of this investigation is to find out whether the resistance increases or decreases as the length of wire increases. The key factor that I plan to investigate is the length of wire, and I will alter the lengths of wire, and measure the resistance during the investigation using an ammeter and a voltmeter.

image10.pngimage00.pngimage01.png

image11.pngimage14.pngimage15.pngimage12.pngimage13.pngimage11.png

image16.pngimage17.png

image02.png

image03.pngimage03.png

image04.png

image06.pngimage05.png

image07.png

image08.png

The diagram above shows wire in a circuit. The current is hitting the wire particles, which slow the current down.

I predict that the longer the wire, the higher the resistance and the lower the current.

The reason for this prediction is that when the current goes through a wire, the current hits the particles of the wire, which slow it down over a longer period of time. The path of an electron is not just a simple direct route from negative to positive, but an electron has a zigzag path, as electrons constantly collide with particles of wire. So the more collisions there are, the more friction there is, acting as the opposite force, and therefore slowing the current down.

...read more.

Middle

I would like to collect as much readings as I can, so I will take readings every ten centimetres. This would mean that I would see a clear pattern.

Observations

1.

Length of wire (cm)

Current (a)

Voltage (v)

Resistance (Ω)

100

1.77

2.17

1.22

90

2.13

1.93

0.90

80

2.10

2.97

1.39

70

2.30

2.03

0.88

60

2.64

1.97

0.74

50

2.76

2.04

0.73

40

3.11

1.94

0.62

30

3.05

1.85

0.60

20

4.50

1.69

0.37

10

5.69

1.45

0.32

image18.png

2.

Length of wire (cm)

Current (a)

Voltage (v)

Resistance (Ω)

100

0.50

0.60

1.20

90

0.54

0.59

1.08

80

0.58

0.57

0.98

70

0.65

0.55

0.85

60

0.71

0.53

0.75

50

0.81

0.50

0.62

40

0.94

0.46

0.49

30

1.06

0.41

0.39

20

1.32

0.31

0.22

10

1.74

0.23

0.12

...read more.

Conclusion

I would have done it this way, but we did not have the resources to do this in the unsafe environment of a classroom. The evidence I have collected is not very reliable because the scientific equipment used in schools can never be as accurate as scientific equipment used in laboratories. Additional evidence could be finding the relationship of resistance through different widths of wire, but for this experiment you would have to get different wires, and possibly create different circuits.

In conclusion: I think that the investigation was realized in the best way possible, giving the time deadline and resources. I am sure that if we had more accurate and new equipment available, these results would all be on the line of best fit. My prediction was correct, as the line does go upwards revealing the link connecting resistance and length of wire: if one increases the other increases as well.

Katarzyna Lakus        Page         5/10/2007

...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. An in Investigation into the Resistance of a Wire.

    Step 3 Sellotaped the E26 wire to the ruler at one end with a little wire extra from the ruler. This is to hold it still so that the length can measure accurately. Step 4 Straighten the wire and put the crocodile clip on 20cm.

  2. Length vs Resistance

    As these charges flow through the wire, they also continually collide with the fixed lattice of atoms that are present in the wire, this creates resistance. The longer the wire is, not only do the electrons have longer to flow through the wire, there are also more collisions there would be between the electrons and the atoms.

  1. Resistance of a Wire Investigation

    If there were lots of people counting the bubbles and the results averaged then that would be a more accurate way of obtaining the information necessary. To extend the investigation you could change certain variables for example the type of plant that you are using to count the bubbles from.

  2. Factors which affect the resistance of a wire

    8.06 Voltage 3 0.92 1.09 1.21 1.24 1.35 1.4 1.45 Current 3 0.95 0.73 0.54 0.41 0.32 0.25 0.17 Resistance 3 0.97 1.49 2.24 3.02 4.22 5.6 8.53 Average resistance 0.99 1.51 2.25 3.07 4.22 5.6 8.22 From this table I can see a pattern emerging as the cross sectional area of the wire gets bitter the resistance decreases considerably.

  1. To Investigate the Relationship between the Resistance and the Length of a Wire

    300 � 1 0.3% 300 � 0.9 2.23 � 0.22 200 � 1 0.5% 200 � 1.0 1.53 � 0.18 100 � 1 1.0% 100 � 1.0 0.75 � 0.13 Analysis and Discussion The purpose of this study was to investigate the relationship between the resistance and the length of nichrome wire.

  2. p5 investigation cwk- resistance of a lightbulb

    3.66 10.81 1.86 5.81 From these results I can see that once I had increased the voltage, the current also increased which meant that there was a rise in resistance. From looking at the results I can see that some results are inaccurate, are outliers, which shows that it was not measured correctly.

  1. How does length and width affect resistance

    In a series circuit, the total resistance equals the sum of the resistances of each device in the circuit. The addition of devices to a series circuit increases the resistance and thus decreases the total current. But in a parallel circuit, adding devices provides additional paths for the current and decreases the total resistance.

  2. Investigate the resistance of different wires and how at different lengths the voltage increases ...

    Temperature This isn't a controlled variable as it very hard to measure the temperature within a wire. The temperature does affect the resistance because if the wire is heated the atoms will move as they have been given the activation energy and enough energy to move this will result in

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