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The aim of this experiment to find the relationship between length of wire and the resistance it will create.

Extracts from this document...

Introduction

Aim:The aim of this experiment to find the relationship between length of wire and the resistance it will create.image00.png

Variable:Here are the list of variables in this investigation…

Control Variables:

  • Voltage of circuit
  • Type of wire
  • Thickness / Cross sectional area
  • Components in circuit
  • Amount of connecting wires
  • Temperature

Input Variables:

  • Length of wire

Outcome Variables:

  • Current
  • Resistance
  • Voltage cross wire

Prediction (Basic): My prediction is that the greater the length of the wire, the greater the resistance.

What Is Resistance: Resistance is when electricity is being slowed down by particles whilst flowing through a material (e.g. metal)

What Is A Metal: Metal is a solid subtance that has the following properties:-

  • High melting & boiling points
  • Conducts heat & electricity
  • Hard & dense
  • Malleable
  • Ductile

Scientist believe that metal atoms or ions are held together by a sea of electrons (see below)

image11.png

Why can metals conduct electricity: Metal atoms have outer electrons which are not tied to any one atom.

...read more.

Middle

0.88

-0.08

120

0.94

-0.08

130

1.00

-0.08

140

1.04

-0.08

150

1.09

-0.07

Second Set:

Milimetres (Length of Wire)

Voltage

Amps

0

0.00

-0.11

10

0.09

-0.11

20

0.20

-0.11

30

0.30

-0.11

40

0.39

-0.10

50

0.47

-0.10

60

0.55

-0.09

70

0.63

-0.09

80

0.70

-0.09

90

0.77

-0.08

100

0.83

-0.08

110

0.88

-0.08

120

0.94

-0.08

130

0.99

-0.08

140

1.04

-0.07

150

1.08

-0.07

Preliminary Conclusion: These two sets of results show that every 10mm the voltage get higher and the amps get lower the reason the amps column is in negative is because the ammeter was connected the wrong way.

Diagram:image08.png

image09.png

image03.pngimage10.pngimage04.pngimage02.pngimage07.pngimage12.pngimage05.pngimage06.png

  Apparatus List: The list of equipment we use is as follows:-

  • Ammeter
  • Voltmeter
  • Nylon Wire
  • Power Pack
  • Bulb
  • A Plank of Wood

Main Method:

...read more.

Conclusion

N/a

Volts

Amps

100mm

0.98

0.12

100mm

0.94

0.07

Volts: 0.98 + 0.94 = 1.92 / 2 = 0.96

Amps: 0.12 + 0.07 = 0.19 / 2 = 0.095

  • Resistance: I worked out the resistance by using ohms law which is R =V/I which translated is resistance = voltage divided by current.

E.g.

Volts

Amps

1.04

0.075

R = 1.04 / 0.075 = 13.86

Conclusion: Like my prediction the resistance increased as the length of the wire increase. The graph is consistent and is basically a y=x graph show if you double the length of the wire the resistance doubles.

Evaluation: In the end the experiment was a success and was exactly as I predicted and was very simple to set up and use the equipment. My graph have no anomalous results because they all fit the line of best fit which is very pleasing. I think my result are reliable because the two sets I did in my preliminary and the final set were all extremely close. I controlled the fixed variable by keeping the voltage the same for all the tests and giving it a break in between the result to keep the temperature the same.

...read more.

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