• 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.

    This is ____2_-_1_ which is the same as is Different in x axis 0.6 - 0.3 calculated before. This means that the gradient is the constant. This is very important because it means that to calculate the resistance according to this constant, one needs to have results which form exactly the same gradient that has been obtained here.

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

    For example a Vmass of 2g would form a crater size of 40mm. And by squaring the Vmass of 2g, it is possible determine the actual mass of the object that caused the impact crater. In this case: * Vmass = 2g * Vmass of 2g?

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

    pressure pad to determine exactly when the load is lifted 0.5m and how long it takes - the timer would be activated when the load started to be lifted and stop when it had been lifted to the height required.

  2. Free essay

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

    * The voltage of the wire - as shown on the volt meter for various distances * Current in the circuit - this will be shown on the ammeter to keep this stable I am going to use a variable resistor.

  1. Planning Experimental Procedures

    * I used a variable resistor to keep to current low to avoid heating effects. I kept the experiment safe, the wire did heat up but not enough to cause a fire. I think that the results that I obtained where a good set because I was fair, accurate and I calculated the averages.

  2. Free essay

    Investigation: How length affects the resistance in a wire.

    This will ensure that the results can be as close to the real resistance as possible. 0.27 is the resistance for the first length, it is number 1. This has much potential to intertwine into what we plug into the formula (For example: 0.27 x 100cm/10 = 2.7 Ohms).

  1. Investigation on Photovoltaic Cells

    The reason I have chosen to measure voltage instead of current is because voltage is a measure of the energy carried by the charge and current is the rate of flow of the charge. As I want to investigate how much electricity is being produced I will measure the voltage.

  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.

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