• 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. An experiment to find the resistivity of nichrome

    Then work out the resistance using the formula V�I=R (Voltage � Current = Resistance) Preliminary Experiment We carried out a preliminary experiment to see the other factors that could affect the experiment and also to see if we could improve any of the steps in the method.

  2. Resistance and Wires

    result taken first in chronological order because here there is no unfairness in the result caused by heat because the wire could not have been heated. This value is 5.88. Obviously this value is not 100% accurate, partly due the fact that the calculations of 'n' were only taken to

  1. Finding a material's specific heat capacity

    This is because specific heat capacities of copper and water vary slightly according to temperature, as does the rate of heat loss. In addition, at higher temperatures the resistance of the circuit will increase and the water could evaporate. * Insulation - for the repeat of the experiment, the same

  2. p5 investigation cwk- resistance of a lightbulb

    In my final I decided to also investigate into a 5W light bulb to see whether it made any difference to the resistance. Final Table of Results - 5W Filament Bulb Voltage (V) Current (A) Resistance (?) 1.00 0.11 9.09 2.00 0.14 14.29 3.01 0.17 17.71 4.01 0.19 21.11 5.01

  1. Choosing a light source

    The bulb I will use and the power out put Distance (cm) Light intensity (Lux) Light resistance (ohms) 20 40 60 80 100 The diagram and the description below shows the two different methods I used for the trailing experiment.

  2. Investigate the effects of resistance on a nichrome wire

    Since the cross sectional area of the wire is being tested, there will be 3 different cross sectional areas. The cross sectional area shall be measured by the micrometer. I will also take down the current and the voltage to calculate the resistance.

  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. Investigating the factors effecting resistance of a wire.

    Aim My aim is to investigate the resistance in a wire and to see the effects if the length of the wire is increased or decreased. Variables Input: 1. Length of wire. * 2. Material of wire. 3. Width of wire.

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