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Investigate how the length of a wire affects the resistance.

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Introduction

Samit Patel

To investigate how the length of a wire affects the resistance

Aim: To investigate how the length of a wire affects the resistance

Background Information: Current is the flow of electrons around a circuit. Resistance is caused by collisions between the atoms and electrons.

Apparatus:

  • Meter Rule
  • Power Pack
  • Wires
  • Voltmeter
  • Ammeter

Diagram:

Prediction:

          My prediction is that if you double the length of a wire, you’ll be doubling the resistance because you will be doubling the amount of electrons which will mean more collisions therefore, this shows there will be twice the resistance. Resistance is caused by free electrons colliding with atoms.

Diagram to back up prediction:

Method:

          I set up the experiment as shown in the diagram. Next, I will measure along the metre rule and connect the wire at a point on the wire.

Length

(m)

Voltage (Volts)

Current (Amps)

Resistance
(Ohms)

Attempt 1

Attempt 2

Average

Attempt 1

Attempt 2

Average

Afterwards, I shall record the readings as shown in the table of the current and voltage using the ammeter and the voltmeter. I shall then repeat this

...read more.

Middle

          I shall do this by using the formula=     Resistivity X Length                                                                                                                

                                                                         ________________                          

                                                                          Cross sectional area        

I can re arrange this formula to show:

                                 Resistivity = Resistance X Area

                                                      _______________

                                                              Length    

image00.png

The graph above is shape of the graph that is expected because if you double the length of the wire, you’ll double the resistance, because you will be

...read more.

Conclusion

I do not think that doing any more results in our experiment would have made it any more accurate. I feel that the only way to make it more accurate would be to use a different method – perhaps were we had a bar that did not bend in place of the wire. We could even use a rheostat in place of the wire, because it is essentially a long coiled wire that is connected at different lengths to change the resistance of the circuit.

Further investigations that could be done in the future are looking at the relationship between the resistance and the cross sectional area of the wire using a micro gauge meter.

...read more.

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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