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

An experiment to find how the resistance of a wire changes when the length is changed.

Extracts from this document...

Introduction

An Experiment To Find How The Resistance Of A Wire Changes When The Length Is Changed

Plan

Aim

In this experiment we hope to see how the resistance of a wire changes when the length is changed.

Prediction

   In this experiment I predict that when the length of a wire increases the resistance will also increase. Thus length is directly proportional to the resistance.

Hypothesis

   I think my prediction is true because the equation for resistance is voltage divided by current. So the voltage and current directly affect the resistance. The resistance should be directly proportional to the length, as two 10cm wires should have the same resistance as a 20cm wire. Ohm’s law states that a current flowing through a metal conductor is directly proportional to the voltage across its ends (provided all other conditions are constant). So I know that if we add a variable – in this case length – resistance will change. I expect that the longer the wire, the higher the resistance. Electrons colliding with atoms in the wire cause resistance.

...read more.

Middle

Resistance R (Ohms)

Second Current

I (A)

Second Voltage

V (V)

Resistance

R (Ohms)

5cm

0.27

0.23

0.85

0.26

0.19

0.73

15cm

0.26

0.56

2.15

0.25

0.56

2.24

25cm

0.24

0.86

3.58

0.23

0.89

3.87

35cm

0.22

1.14

5.18

0.21

1.17

5.57

45cm

0.21

1.38

6.57

0.20

1.40

7

55cm

0.19

1.60

8.42

0.19

1.61

8.47

...read more.

Conclusion

      To gather more relevant evidence we could have done the experiment with a different metal just to see if the resistance still went up when the length was increased. The resistance would change in this new wire depending on how many atoms were in the wire. Also we could have changed the width of the wire and I think that as the width of the wire got larger the resistance would decrease, as there would do more room for the electrons to move.

...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. An experiment to find the resistivity of nichrome

    I know this because the Line of Best Fit is a straight line showing that if the length of the wire is increased then the resistance of the wire will also increase. Conclusion In my prediction I said that : ���K.if the length increases than the resistance will also increase

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

    We made sure not to swap these people around because maintaining the accuracy of our results relied upon both the reaction time and hand-to-eye coordination of these two people. Changing them around would have meant using people with different reaction times, so the test would have been unfair.

  1. To find out how the resistance changes as the length of the wire changes.

    This is because there is less room for the free electrons to collide and therefore friction from them creates heat and if the temperature increases, the resistance of the wire also increases.

  2. Did a Secret Military Experiment Cause the 2003 American Blackout?

    and geomagnetic activity that could cause problems with the power-grid were non-existent HAARP is a phased-array ionospheric heater that is capable of focusing large quantities of electromagnetic energy into very localized regions that are very far away from the source.

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