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

To investigate the factors that affects the resistance of metal wires.

Extracts from this document...

Introduction

Resistance of a wire

Aim

To investigate the factors that affects the resistance of metal wires.

Introduction

Resistance is a force that opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around the circuit. The circuit itself can resist the flow of particles if the wires are either very thin or very long. E.g. The filament across an electric light bulb. A resistor has the resistance of one ohm if a voltage of one volt is required to push a current of one amp through it. The resistance is measured in ohms (   ). Resistances is important in an electric circuit, as,

Preliminary Experiment

  In this experiment, I am working out whether length

...read more.

Middle

How it is controlled.

The length of the wire

This will be the only thing in the experiment I will change. I will measure it on a metre ruler.

The diameter of wire

I will use the same piece of wire the whole way through the experiment so it will stay the same.

The current

The current needs to stay the throughout the experiment. I will measure this with an ammeter and I will also use a resistor to make sure the amp can stay as close to each other as possible.

The heat of the wire

It will be hard to keep this the same but I

...read more.

Conclusion

The length of the wire will make a difference to the resistance. This is because when you have a long wire, the electrons have to squeeze together for longer to be able to pass through the wire than they do in order to be able to pass through a short wire. I predict that the longer the wire, the greater the resistance. For example, if I had a 30 cm wire and a 60 cm wire, the 60 cm wire would have a resistance twice that of the 30 cm wire. The more the electrons bump together, the higher the resistance

...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. Peer reviewed

    Investigation in resistance in wires

    5 star(s)

    The equation for resistivity is below: ? = Resistivity (?m) R = Resistance (?) = Length of the piece of conductor (m) A = The cross-sectional area of the conductor (m�). I then calculated what each letter was in numerical value for my data.

  2. Resistance and Wires

    When I was recording the current for this experiment, it is most likely that I either misread the ammeter when recording current (56amps instead of 0.56amps), or it could have been a typing error. I may have entered 56amps into the table instead of 0.56amps.

  1. Investigate one or more factors affecting the resistance of metal wires

    > Type of material - alloys have a higher resistance than pure metals (like copper). > Temperature - hotter wires have more resistance than cooler wires. In my preliminary work, I will need to decide factors to investigate the resistance of a wire which are easy to measure accurately, and

  2. Resistance of wires

    a practical which tests the resistance of the wires of different lengths. The following apparatus is what I utilised in my practical: * Power Pack (electricity source) * Wires (to link up a complete circuit) * Crocodile clips (to connect circuit to the wire being investigated)

  1. Conductors and Insulators.

    and a wire. What a battery produces is electrons. The figure below shows the shape of the magnetic field around the wire. In this figure, imagine that you have cut the wire and are looking at it end-on. The green circle in the figure is the cross-section of the wire itself.

  2. Resistance of wires.

    I expect that if I choose a circuit containing a power pack and use a voltage of 2 volts I will get a measurable current and voltage so I can work out the resistance. Preliminary Experiment Apparatus used Voltmeter Amp meter Wires Power pack Crocodile clips Constantan wire Cellotape Metre

  1. Resistance of Wires

    I predict that the graph will be in this general shape: PRELIMINARY WORK: METHOD: The apparatus was set up as shown above. I measured and cut one piece of wire from two different thicknesses of wire to determine which to use in the actual experiment: I used 0.32 mm (30 swg - the thinnest wire)

  2. To investigate the factors which effect the resistance of a metal wire.

    Firstly, temperature is a factor. If the wire is heated, the atoms will move around more because there will be an increase in energy. This would cause more collisions between the atoms and the electrons. The increase in collisions would cause the resistance to rise.

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