• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Effects change of diameter has on to resistance.

Extracts from this document...

Introduction

Effects change of diameter has on to resistance.

I am going to be measuring what effect diameter of a wire has on resistance of a wire.

In my prediction I will be considering two equations.

I will have to rearrange this equation to make R the subject. Once I have done this I will get an equation like this.

In this equation R is resistance, A is the cross sectional area, P is the resistivity and L is the length.

In this equation I also need to substitute in the equation for area, therefore the equation will also be linked to diameter of the wire. The equation I will be substituting into the above is.

π.d2

When this is substituted into the equation for resistance it will give me an equation like this.

I am going to be trying to find out the relationship between resistance and diameter. In my experiment I will make a circuit as follows.

A wire is placed into the two crocodile clips and pulled straight. The wire must be of about 1.

...read more.

Middle

0.56

0.005

1%

0.57

22

0.71

0.7

0.71

0.005

1%

0.71

20

0.92

0.92

0.92

0.005

1%

0.92

18

1.21

1.21

1.22

0.005

0%

1.21

1

2

3

Voltage (V)

Current (A)

Resistance (Ω)

Voltage (V)

Current (A)

Resistance (Ω)

Voltage (V)

...read more.

Conclusion

There are lots of sources of error to be taken into a account, like when measuring out the meter of wire, this wont cause a lot of error but it builds up. Calculating 1/(d/)^2 will create a reasonable amount off error, these all have to be taken into consideration.

I took these sources of error into consideration and to reduce them you could, increase the size of measurement you are taking to reduce the percentage error. Also if I used a analogue ammeter and voltmeter I could have reduced the amount of error. Most of my uncertainties were about 1% so this isn’t massive but it will effect my line of best fit. If I was to reduce my uncertainty’s by taking more time and using more accurate measuring equipment I could have produced a more accurate line of best fit.

For my experiment the overall percentage uncertainty is about 2% calculated to 1 decimal place. This isn’t very big therefore I think my results are reasonably reliable and this relationship I have show is valid.

...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. Does the height of a crater affect the diameter of the crater produced?

    This is the higher the object the bigger the potential energy. To work out the potential energy you have to use this sum: Potential energy = Mass X Height X Gravity Pe=MHG Gravity is always 10N/KG unless it is stated otherwise.

  2. Investigate how mass affects the diameter of an impact crater.

    formula shows that the gravitational potential energy is directly proportional to both the mass and the height of an object. Hence this shows that the heavier an object is, the more gravitational potential energy it has, and the higher an object is, the more gravitational potential energy it has.

  1. To find out what happens to the efficiency of a motor as I change ...

    If we had, different equipment would have made our results inaccurate. The resistance of the wires used and of the motor would have been different, as length and amount of rust or damage can alter this. Also, we had no guarantee of using the same motor again, which is vital when testing efficiency.

  2. Investigate how mass affects the diameter of an impact crater.

    Therefore the angel of collision has an influence. Each of the above mentioned factors do have a form of influence to an asteroid collision, however not all can be recreated in accordance to my experiment. Therefore I will rule out each factor that is irrelevant or shows a sign of possible obstruction when it comes to doing the actual experiment.

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