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

How the area of a wire affects resistance

Extracts from this document...

Introduction

Alex

...read more.

Middle

 How the area of a wire affects  resistance

Planning

Background Physics:

What is resistance?

Electricity is conducted through a conductor. In this case it is the wire. Resistance is the word used to describe the opposition to the flow of current. The more free electrons there are, the better the conduction and the lower the resistance is. For example gold is a better conductor then aluminium, therefore it is a better conductor . The more atoms vibrate, the more resistance there is. The free electrons are given energy, as a result they move and collide with the surrounding electrons. This happen throughout the whole wire. This happens because electricity is passing through the wire This is how the electricity is conducted. Resistance is the result of energy loss in the form of heat. If the cross-sectional area doubles, the resistance halves. Resistance is caused by electrons bumping into ions. If the length of the wire is doubled, the electrons bump into twice as many ions so there will be twice as much resistance. If the cross sectional area doubles, there will be double the amount of ions bumping into electrons into each other.

...read more.

Conclusion

image01.png

X

Y

1

1

2

0.5

3

0.333

4

0.25

image02.png

To test this I have plotted an average 1/Area. If it is correct then I should  get a straight line. When I plotted the graph I had a straight line.

This tells me that the average is proportional to 1/Area i.e. Rave α 1/Area.

The slope is: y/x= 10.5/16= 0.66 Ω m²

I am ignoring the offset on my 1/Area graph

This experiment shows me that resistance is definitely affected by the area of the wire. Looking at my background physics it has worked out like resistors on a parallel circuit. When attaching another wire to the experiment it acts like adding another  parallel resistor in a parallel circuit.  So if the area of the wire increases the resistance decreases. Also I have learned if the voltage goes down the resistance goes up. This shown by the two graphs  I have plotted.

Evaluation

I found this experiment easy to do. I had no anomalies on my graph. This means that the points I have plotted are all in a acceptable arrangement. There were no experimental caused by a faulty connection. There were no safety hazards and the experiment was safe to do.  

...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. How the Resistance of a Wire is affected by Cross-Sectional Area

    I think this because of my prior scientific knowledge which shows that the wider the wire the more electrons that will be able to flow through them and the less collisions. But in a thinner wire there is less space for the electrons to move therefore more collisions.

  2. To investigate how the length (mm) and the cross-sectional (mm2) area of a wire ...

    length as the variable to turn out as directly proportional, I wasn't surprised with the results. All the graphs for length turned out similar, as all of them were directly proportional. This is called Ohm's Law. This states the voltage across a wire is directly proportional to the current across it provided the temperature remains constant.

  1. Investigating How the Cross-Sectional Area of a Conductor Affects the Resistance of Current Passing ...

    I will make sure that the current remains at a constant recordable level. I will ensure that the lengths of wire used remain at a constant temperature which will be as close as possible to room temperature. I will use different resistant wires with identical lengths.

  2. Planning Experimental Procedures

    be able to pass through nichrome wire than they do in order to pass through that copper wire. I predict that the higher the temperature of the wire, the faster the rate of electrons flowing through it because heat speeds up conduction.

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