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Resistivity of Wire

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Introduction

Stephanie Corris

Resistivity of Wire

Aim: To find out how the resistance of a piece of wire can be changed.

Electricity is a flow of charged particles around a circuit, electricity flows in a current. A current is the flow of electricity through something or along a wire. Voltage is the driving force that pushes the current round.  In a wire the charged particles are electrons, the charged particles are negatively charged so they will be attracted to the positive terminal. Resistance is anything that opposes the movement of the electrons.

 Some factors affect the resistance of wire because…

 The factors that are likely to affect the resistance of wire are:

  • Length

- The more electrons have to be pushed along the wire (resistance), so the longer the wire the more electrons have to be pushed.

  • Thickness

-  

...read more.

Middle

I

R

Observations

32

5.3

2.47

2.15

Smokey, hot

26

3.5

4

0.88

A little hot

24

3.2

5.5

0.58

Too hot!

20

2

7.4

0.27

Stinks!

This has influenced the plan of our experiment because we now know that the type of wire we are going to use is Nichrome because it didn’t get very hot and it doesn’t have a particularly high or low resistance. We are going to use 26 SWG’s because it didn’t get too hot.

Our prediction is that the shorter the wire the lower the resistance (high amps, low volts.) So that means the longer the wire the higher the resistance (low amps, high volts.)  

Method:

We are going to make a circuit which includes:

  • Power pack
  • A volt meter
  • An ammeter
  • A meter rule which is attached to a piece of Nichrome wire.

We are going to read volts and amps off the meters to see what length of wire produces what readings, for these two measurements.

...read more.

Conclusion

Our results match our prediction, we were correct.

I think that the experiment was good at answering the aim as we have found out how the resistance of a piece of wire can be changed. I can notice two slightly anomalous results (circled) in my graph. These were at 20cm and 60cm; there readings fall slightly off the line of best fit. I can say that I found out how the resistance of a piece of wire can be changed by saying that for the Nichrome wire, if you change either the length of wire, the volts or the amps then the resistance will change.

Dr Johnson – Science – Due 10/05/2007 -

...read more.

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