# The Factors Affecting The Resistance Of A Wire

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Introduction

Samir Khan 4S2 Factors Affecting Resistance Of A Wire

Mr. Kerr

The Factors Affecting The Resistance Of A Wire

Plan

Aim: - The aim of this investigation is to investigate what effects different factors have on the resistance of a wire.The investigation will determine what effects the factor we choose has on the resistance of a wire.

Variables and Key Variables: - There are many possible independent variables that could be changed in order to affect the dependant variable. The dependant variable in this experiment is that of resistance. This means that resistance will not be changed or controlled during the resistance but the independent variable will be used to change it. I came up with many initial ideas for things that could be used as the dependant variable in my investigation. These include: -

- Length
- Width- Diameter/Cross-Section
- Current
- Voltage
- Temperature
- Material
- Room Temperature
- Age Of Wire
- Humidity
- Light
- Pressure
- Magnetism

Preliminary Work: - In order to find out the best variable to investigate with regard to what affect it has on resistance a number of preliminary tests had to be carried out. The aim of these small-scale experiments was to see which of the possible dependant variables have an effect and then to find out which of them would be best to investigate. Some possible variables had to be ruled out from the start.

Middle

Diameter 0.914cm

Length (cm) | Resistance |

10 | 1.3 |

50 | 1 |

90 | 0.7 |

Diameter 0.152cm

Length (cm) | Resistance |

10 | 2.6 |

50 | 13 |

90 | 24.5 |

From these results in the preliminary experiment it is obvious that the greater the width the greater the resistance and therefore the greater the range of resistances in our results. Therefore from this experiment I conclude that I decided to use diameter 0.152cm for the main investigation.

Conclusion

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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