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

    on the outer shells, then this means there are more electrons available. So, in theory, if the material has a large number of atoms, there should be less resistance, because of the higher number of electrons .If the atoms in the wire are closely packed, then this will cause an increase in resistance, due to frequent collisions.

  2. Resistance of a Wire Investigation

    had been produced, and in another reading it was just before, this could have had a negative effect on the accuracy of my results. I therefore ensured that in each case I started the stopwatch just after a bubble had been produced, thus heightening the accuracy.

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

    Accuracy with the equipment In order to reduce errors it is necessary to choose accurate and reliable equipment. But the only equipment that were available for us to use at the time we the normal ammeter and volt meter which are not as accurate as the multi meters.

  2. Find out how the length and width affect the resistance of a graphite track.

    (Must explain how you intend to do this) I will again take a readings from 27cm down to 2cm. 7.Using the guillotine I will cut off 1cm of the width and then measure the resistance of the track at the 20cm point of the length. 8.Two centimeters will be cut off each time, until the track is 1cm wide.

  1. How does length and width affect resistance

    Such a path is called an electric circuit. A simple circuit. Suppose you want to make a battery-powered light bulb shine. Electric current will only flow if there is a complete circuit that leads from the battery to the bulb and back to the battery. To make the circuit, connect a wire from the positive terminal of the battery to the light bulb.

  2. How does the length of a wire affect its resistance

    * Voltmeter * Wires * Crocodile clips Safety * Be aware of the hot wire as fingers or hands may be burned * Heat proof mat Prediction I predict that different wires have different resistances. Method * Cut up 30 cm of each wire in length.

  1. Length vs Resistance

    and voltage are the ones I want to be using in the main investigation and that at no point does the current exceed 1A. Using my test investigation, I was able to re-evaluate the measurements I was going to use in my main investigation and through this, I decided that

  2. p5 investigation cwk- resistance of a lightbulb

    Also I decided to use another smaller bulb with a decreased wattage to ensure that the conclusions that I had made are correct. For this experiment I completed the investigation with a 5W and 24W Filament Bulb, recording the voltage and current at particular intervals.

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