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

Factors Affecting The Resistance Of A Metal Wire.

Extracts from this document...

Introduction

Helen Roberts 10P

March 2003

Physics AT1

PLANNING

Factors Affecting The Resistance Of A Metal Wire

  1. Investigate some of the factors that affect the resistance of a metal wire. The current and voltage will be measured and then V = IR will be used to calculate the resistance. The potential divider circuit produced better results in the investigation into how resistance depends on the number of identical resistors connected in series, so this circuit will be used for this investigation, too.

Variables and Constants

  1. Possible  variables include  the length  of the wire, the diameter of  the wire, the  material of the wire and  the  temperature.  The  chosen  variable is length of  the wire.  Because  this is  the chosen variable, all of the others must be kept constant. The graph I will  plot  will be the length of the wire (in cm) against the resistance (in Ω).

Trials

  1. Trial using a short length and a long length (10cm and 60cm) of each of the three types of wire. The three types of wire are as follows, copper 0.274mm, nichrome 0.274mm and nichrome 0.457mm. The voltage and current will be measured and the resistance calculated (using V = IR). The wire that has the largest variation between the two measurements will be used, to provide the best results possible.

Preliminary Work

...read more.

Middle

Length of Wire (cm)

Current (A)

Voltage (V)

Resistance (Ω)

50

0.150

1.350

9.000

100

0.090

1.640

18.200

150

0.060

1.710

28.500

200

0.050

1.740

34.800

250

0.040

1.690

42.250

300

0.030

1.550

38.750

Repeat 1

Length of Wire (cm)

Current (A)

Voltage (V)

Resistance (Ω)

50

0.130

1.220

9.380

100

0.080

1.380

17.250

150

0.060

1.510

25.167

200

0.040

1.580

29.500

250

0.040

1.610

40.250

300

0.030

1.620

54.000

Repeat 2

Length of Wire (cm)

Current (A)

Voltage (V)

...read more.

Conclusion

Reliability

  1. When the readings were repeated, the trend was the same, so I think that the results were quite reliable. That is why I think the evidence is sufficient to support a firm conclusion.

Anomalies

  1. I had one anomaly, and I think that it was because of an error when measuring the length of wire, or perhaps when reading the multimeters. Because there was only one, I think that the rest of the results are good.

Improvements

  1. I could use more lengths, such as going up to 500cm instead of 300cm. Or use smaller difference between the lengths, such as 10cm, 20cm, 30cm and so on. These could give me a clearer picture of the pattern when increasing the length.

Improving the Reliability

  1. I would try and be more careful when measuring the length of wire used, as I think that is why I had an anomaly. This would improve the reliability of the results, as they would be true to the length of the wire.

Extending the Investigation

  1. To extend the work I could use a different type of wire, or adjust the lengths I used. This would show the trend when varying the lengths and would lead to a better conclusion, and would see if the type of wire affected how the resistance changed.

...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

Here's what a teacher thought of this essay

4 star(s)

This is a well written report.
1. The report lacks an introduction section that contains researched information.
2. The numbers need to be removed from the structure.
3. The conclusion and evaluation are both strong.
****

Marked by teacher Luke Smithen 13/08/2013

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. To investigate which fuel gives out the most energy when burnt. We are burning ...

    Ethanol (repeat) -weight Temperature Start- 168.23 Start- 39�C End- 161.46 End- 50�C Burnt- 0.77 Rise- 11�C Ethanol (RMM) = C2H3OH= 46 Energy released= 11 x 100 x 4.2 Moles = 0.77 � 46 = 0.0167 = 4620 Energy/mole = energy/moles = 4620�0.0167 = 276.65KJ/MOL 1.

  2. The Bouncing Ball Experiment

    scales One standard size ping-pong ball Two Metre-long Rulers *There must also be access to a staircase that rises to at least five cm (500cm) from the ground. Diagram: Method: A tape measure was used to measure where on the stairs the height we desired from floor to staircase was.

  1. A Resistance Investigation - Independent Variables

    a given wire varies with its length Independent Variable The length of the wire is the variable we will be changing. Dependent Variable The variable we will be measuring is the resistance of the wire. We will be calculating this by measuring the potential difference across the specimen wire and current through the specimen wire.

  2. Electromagnets - What factors affect strength of an electromagnet?

    Scientifically the strength of an electromagnet will increase, when a larger current is applied. This is because electrons behave like tiny magnets, because when they spin in the same direction, a magnetic field is generated. The magnetic field will increase even more if the current applied is increased, because the

  1. Investigating how the resistance of Nichrome wire depends on its length

    I can explain this by using the collision theory. When a power supply is connected in a circuit an electric field is set up in the wires. Potential difference (PD) is a property of this electric field. The free negative electrons in the wires experience a force in the electric field and therefore flow down the wire.

  2. An experiment to find the resistivity of nichrome

    my main experiment when investing the connecting between the length of the wire and the resistance of the wire. To ensure a fair test whilst carrying out my preliminary experiments I am going to be very careful when selecting my independent variables which are the width of the wire and the wire material.

  1. Factors Affecting the Efficiency of a Wind Turbine

    PILOT The aim of the pilot was to see if the investigation is possible and also to show clearly what needs to be done and how it should be done during the experiment. On this pilot investigation, it was discovered that the voltmeter could never be used because it was changing continuously.

  2. To investigate how a height of a ramp affects the speed of a trolley ...

    The affect of friction also contributed to this. Using the results from my experiment I can work out the amount of potential energy, how much was converted into potential energy and the amount lost during the process. Therefore, as the height of the ramp increases the potential energy increases.

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