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

What effects resistance through a wire?

Extracts from this document...

Introduction

GCSE Science coursework- Nick Brooks 10 AM

What effects resistance through a wire?

Introduction- Resistance

Electricity passes through all the components of a series circuit, but the components are not all the same. Some of them allow current to pass easily, whereas others slow the current down. This is called resistance. The more a component resists the flow of electricity or electrons, the lower the current in the circuit will be. Resistance also exists in wires. There isn’t as much resistance in wires as components although there is a small amount. The measurement of resistivity is in Ohms. Ohms go by ‘Ohms law’ which has been explained below.

Ohms law

Physical principle stating that the electric current flowing through a metallic conductor is directly proportional to the potential difference between its ends, as long as the temperature stays the same. The law is named after the German physicist who discovered the relationship in 1827, Georg Ohm. The ratio of the potential difference to the current is called the resistance of the conductor, and is measured in ohms, symbol Ω. A potential difference of 10 V (volts) is needed to make a current of 2 A (amps) flow through a conductor with a resistance of 5 Ω. In symbols, V = IR, where V is potential difference, I is current, and R is the resistance.

...read more.

Middle

Ammeter.

Method

  1. Check wires for damage and use safe area.
  2. Connect up the circuit.
  3. Plug in power pack and switch on.
  4. Record results from voltmeter and ammeter.
  5. Repeat for different wire type, thickness and length
  6. Record results and work out resistance values.
  7. Draw graphs and evaluate experiment.

Prediction

I think that with the wire length variation experiment, the greater the length, the more resistance there will be. I think this because, with a larger length of wire, it would take a longer period of time for the electrons to pass, meaning that more electrons will get caught up thus producing more resistance. In the varying of the thickness of wire, I predict that, the thinner the wire is, the more resistance there will be. I think this because, in a thinner wire, the electrons have a smaller area to pass through so when they rub against the inside of the wire. This produces a build up of heat, which causes a lot of friction. The friction slows the electrons down which causes a greater resistance. With the varying of wire types, I cannot back up any prediction other than the two resistivity values.

...read more.

Conclusion

Do my results match my predictions?

Yes, my results did match my predictions. I predicted that the thinner wire, the longer wire and the Nichrome wire all produced more resistance. The wire thickness experiment worked correctly and in conjunction with the ‘collision theory.’

Evaluation

As far as experiments go my results were fairly accurate. To get flawless results would be almost impossible as not all elements can be altered to obtain the optimum conditions. I could have got slightly better results but it would be a very small difference to the results I obtained.

The method that I used was the simplest and most accurate way to do the experiment. The only thing that may interfere with the results, is the resistance in the connecting wires, or electricity lost through the crocodile clips. Another thing that might have a small part in making the results impossible is that not exactly the same amount of voltage will come out of the circuit each time.

The only real improvement that I could make to the experiment is to repeat the experiment many times to get averages, which would gain more accurate results. Further experiments I could do to find out other things, which effect resistance through a wire, are to try other varieties of wires to find out what elements have the most resistance. Another experiment to also try is to experiment in different conditions and working environments to see what also effects resistance through a wire.  

...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. Resistance and Wires

    of the range bars would have been recorded later on when the wire was hotter. If I were to conduct this experiment a second time, I would increase the amount of time that the power was turned off, to ensure a sufficient amount of time to allow the wire to fully cool down.

  2. Finding a material's specific heat capacity

    Skill C Results: Experiment One Experiment Two Mass of copper block/kg: (� 0.0005 kg, � 0.4982%) 1.0035 1.0035 Volume of distilled water/l: (� 0.0005 l, � 0.1786%) 0.272 0.288 Starting voltage/V: (� 0.005 V) 8.76 8.89 Final voltage/V: (� 0.005 V) 8.74 8.89 Average voltage/V: (� 0.005 V, � 0.006%)

  1. An experiment to find the resistivity of nichrome

    I am going to use a constant voltage of 2 volts and a constant length of 50 cm. Apparatus: Meter ruler �V To measure the wire being tested to ensure a fair test. Selection of wires �V Different materials and widths but the same length.

  2. Investigate the effects of resistance on a nichrome wire

    used, but instead of a nichrome wire, I shall use a copper wire instead. For the third and final experiment the constant variables that I will test are: * The wire shall be nichrome * The voltage * The length of the wire * Room temperature These values will stay constant to ensure a fair test.

  1. How the Resistance Effects a Wire.

    could round of to the SWG and see what SWG I get. Then I will work out the resistivity. For all the above trials after you have got all of the results for the three trials, you need to get the resistance(R)

  2. p5 investigation cwk- resistance of a lightbulb

    Final Plan - While completing my Final Investigation I had decided to concentrate on the equal jumps in voltage to see whether it affected the resistance of light bulbs. To have done investigation correctly, I started to move the dial so it was set to a particular voltage.

  1. Investigating the factors effecting resistance of a wire

    Also if the atoms in the material are closely packed then the electrons will have more frequent collisions and the resistance will increase. 3.Wire length : If the length of the wire is increased then the resistance will also increase as the electrons will have a longer distance to travel and so more collisions will occur.

  2. Choosing a light source

    This means that there is no bill. They cost a lot to buy compared to other electric powered light bulbs. There is no wires that are needed for the light. This makes it less fiddly. The light can only be used in a place where the sun will reach it as it will not charge if the

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