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

In this piece of coursework, the class has been asked to investigate the resistance of a wire (Copper).

Extracts from this document...

Introduction

Resistance Of A Wire

Aim:

In this piece of coursework, the class has been asked to investigate the resistance of a wire (Copper).

The thin wires in lamps tend to resist the movement of electrons across it. This Wire has a certain resistance to the current. The greater the resistance of the wire, the more voltage is needed to punch the current through the wire. The resistance of a wire is directly proportional to the current and this is calculated in this way:

               Resistance (R) = Voltage (v) across the wire in (p.d)

                                           Current (I) through the wire

In 1826, George Ohm discovered that the current flowing through a metal wire is proportional to the potential difference across it, providing the temperature remains constant.

...read more.

Middle

image06.png

image09.pngimage09.pngimage07.pngimage07.png

                                           More electrons going through due to image15.pngimage10.pngimage14.pngimage02.pngimage07.pngimage12.pngimage11.pngimage03.pngimage02.pngimage03.png

                                           Cross-section width.

Variables:

  • The main variables, which affect the resistance, are the length and width of the wire and the voltage.
  • The independent variable, which I will be altering, is the length of the wire.
  • The dependant variable, which I will be measuring, is the resistance of the wire.
  •   The control variables that I will keep the same is the voltage

Apparatus:

  • Voltmeter                              
  • Ammeter
  • Switch
  • Variable resistor
  • Electrical Supplier (Power Pack)
  • Wire

Method:

The apparatus have to be put together in a series circuit as shown in the diagram that follows. The variable resistor is a part of the circuit, but is just to enable that once a suitable current is found, it is used through the whole experiment.

...read more.

Conclusion

In my prediction, I predicted that the longer the length of the copper wire, the higher the resistance will be and this is because the longer the wire, the more energy is needed to push and force the electrons through the wire. This theory or scientific explanations supports my results and prediction.

Evaluation:

I think the experiment went quite well and successful due to the results being accurate and reliable enough to support my prediction and theory which was the longer the length of the wire, the higher the resistance will increase. They were accurate because as the wire gets longer, the resistance increases too.

I could have improved my experiment and my results by cutting the copper wire more accurately for each of the ten lengths.

...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. Physics Coursework

    At: Potential Difference /V Calculated Temperature From Calibration / �C Actual Temperature / �C 0.989 24.0 23.5 0.731 36.0 35.0 0.475 53.5 52.0 0.220 80.0 78.5 Analysis: I have achieved all of the following results using the equipment stated. The two calibration curves have the general logarithmic properties as generally expected when using this set up.

  2. Resistance Coursework

    For example if sometimes copper is used and sometimes nichrome is used, the results where copper is used will be of a low resistance because of the material and not because of the diameter of the wire. Throughout the experiment Constantan will be used.

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