• 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 length of a wire affects the resistance.

Extracts from this document...

Introduction

An experiment to find how the length of a wire affects the resistance

Aim

The aim for this experiment is to find out how the length of a wire affects its resistance and voltage.

Procedure

I intend to investigate the relationship between the length of wire and its electrical resistance.  I shall vary the length of the wire but keep such variables as the temperature and the diameter constant.  I will make sure the voltage and the current are consistent before working out the resistance.

Method

I will set up a circuit as the diagram that is shown below. I will connect the positive terminals of the two cells up to the ammeter that will monitor the current in the wire. After this, I will connect the circuit to a variable length of constantan wire. I will connect a voltmeter parallel to this length of wire. This will measure the voltage across it. I will use a spade connector to alter the length of constantan that will be used for each individual experiment. This spade connector will be connected to a variable resistor before another connection links the variable resistor to the negative terminal of the cells. I will measure out 10cm from the connection of the normal constantan wire and hold the spade connector there.

...read more.

Middle

0.6

3

0.59

2.95

40

0.74

3.7

0.73

3.65

0.73

3.65

50

0.86

4.3

0.88

4.4

0.94

4.7

60

1.1

5.5

1.06

5.3

1.1

5.5

70

1.23

6.15

1.22

6.1

1.29

6.45

80

1.37

6.85

1.47

7.35

1.46

7.3

90

1.59

7.95

1.58

7.9

1.56

7.8

100

1.8

9

1.73

8.65

1.8

9

Experiment 4

Experiment 5

Length of constantan wire (cm)

Voltage (v)

Resistance (ohms)

...read more.

Conclusion

Improvements

If I were to repeat the experiment, I could make several improvements to improve the level of such factors as accuracy and safety.  For example, I could ensure that the connections were securely fastened or even bolted to increase both safety and accuracy.  I could also get as many opinions as possible or get some sort of machine to measure the length of the constantan wire. I could increase the number of times I carry out each of the scenarios.  This would improve accuracy even more.  I would check the wire and ensure that there were no bends or kinks in it because this would affect the flow of electrons through it.

Further work

If I were ever to do this experiment again, I could consider investigating another of the key factors involved with this investigation. For example, I could change the type of wire, the temperature of the wire, the diameter/width of the wire. I could also choose to vary the current or the voltage and, therefore change the dependent variable as well.

...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. Investigating how the length of a Wire affects its resistance.

    The results also show resistance and length of wire as being directly proportional to each other. My hypothesis, however, does not give any reasons for the results not being exactly proportional with each other i.e. why there are and should be anomalous results.

  2. Free essay

    Aim: the aim for this experiment is to check if the length of a ...

    in the resistance and see whether or not it agrees with my prediction. How the collected data was made reliable: * I used a wide range of lengths - 5 * repeated the experiment 3 times so its reliable * Averaged out the 3 readings What is resistance?

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

    The drag depends on its shape and area. Hence the flat curve demonstrates the point at which terminal velocity has been reached. In order to validate that crater size is proportional to the square root of mass I will produce a line graph showing the relationship between two.

  2. Investigation on Photovoltaic Cells

    * I also changed how long I would wait to take the reading. In my original method I decided 5 seconds but changed this to 10 seconds so the reading would have longer to set. * I also changed the various surface areas I was measuring.

  1. Free essay

    Investigation: How length affects the resistance in a wire.

    4.00 4.01 4.02 Current (A) 14.81 14.82 14.83 Resistance (W) 0.27 0.27 0.26 0.27 0.2- Voltage (V) 4.02 4.02 4.01 Current (A) 7.41 7.41 7.41 Resistance (W) 0.54 0.53 0.54 0.54 0.3- Voltage (V) 3.98 3.99 4.02 Current (A) 4.88 4.88 4.89 Resistance (W) 0.82 0.82 0.81 0.82 0.4- Voltage (V)

  2. The aim of my investigation is to find out how the length of a ...

    Poor conductors tend to resist the flow of electricity compared to the good conductors. Resistance changes energy into heat. Why most metals are good conductors: Everything is made up of atoms. These atoms contain electrons. Insulators have electrons, which are held tightly to their atoms.

  1. To find out what variable affects the resistance of a wire.

    (Source= physical processes, Nick England) Wire type (material) - Different materials will have different numbers of atoms and so the flow of electrons will depend on the type of material and the number of atoms in it. (Source= physical processes, Nick England) APPARTUS: Wire: Copper 26, 32 (standard wire gauge.)

  2. Planning Experimental Procedures

    Turn off the two digital metres and disconnect all the wires 5. Reconnect all wires and turn on the meters. 6. Record the meter readings again until you have 3 sets of recordings for each wire. Suitable number and range of observations planned I intend to measure the resistance of 10 different wire lengths.

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