• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11
  12. 12
    12
  13. 13
    13
  14. 14
    14
  15. 15
    15
  16. 16
    16

To Investigate how the thickness of a wire affects its Resistance.

Extracts from this document...

Introduction

Physic's Coursework Richard Carragher, S2D RESISTANCE AIM: To Investigate how the thickness of a wire affects its Resistance. Background Knowledge. The electrical supply can be quite easily compared to the water supply we all have in our homes for our heating. The battery can be easily compared to a water pump as they both have to push a flow around a circuit. A resistor can also easily be compared to a water flow constrictor, both slowing down the flow and power of the push. If the voltage is increased the current is increased. If you increase the resistance the current is decreased. CHARGE = CURRENT x TIME Q = I x T The current I with a value ampere, 1A is the number of charges flowing past a point every second. Charge Q is measured in Coulombs, C. Short Circuit: A short circuit happens when the current in a circuit travels along the easiest path it can find. The easiest path is always the one with the least resistance. ...read more.

Middle

I will measure the current with an ammeter. I will change the thickness by putting the wires in parallel. I will keep the material the same by using constantan wire. I will keep the temperature the same by only turning the circuit on for a few seconds so the current will not heat up the wire. I will keep the length of resistance wires the same by measuring the length of a wire using a meter stick. The ammeter will be in series to measure the current. The voltmeter will be in parallel to measure the voltage. Prediction I predict the more wires in parallel will create less resistance. Comparing the electrical system to a traffic system whenever six cars are in one lane the traffic moves slowly but when that lane is split into more lanes the traffic speeds up. The current starts at 12A in one wire but when we introduce another wire the current is split between the two wires. The more wires that are introduced in parallel the more the current will be split therefore increasing the overall current. ...read more.

Conclusion

Graphs Conclusion By looking at my results I can conclude that the more wires there is in parallel the more the resistance in the wires will decrease and there will be more current flowing though the circuit. This is because the added wires in parallel are the same as decreasing the thickness of the constantan wire. The higher we put the voltage the more current we push though the circuit. This is exactly as I predicted and it shows that comparing the electrical system to a traffic system actually proves that the more wires there is the more the resistance will decrease. This shows that there is a higher current so the more wires we put in parallel the more we increase the electrical current. Evaluation If I were doing the experiment again I would change the length of the wires as well as change the thickness. I would do this so I could get a better overall picture of how resistance is affected in a circuit. I would make the electricity wasn't on for as long so the wires would not heat up much - as this can affect my readings. I would measure the wires more accurately so no two wires were different. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics 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 AS and A Level Electrical & Thermal Physics essays

  1. Investigate how the temperature affects the resistance of a thermistor.

    but I do not have enough evidence to support this statement. These properties in a thermistor make it very useful in industry for things such as machinery that can be damaged if it over heats. Putting a thermistor into a circuit such as that could mean that if the machine

  2. resistivity if a nichrome wire

    Table of errors (absolute/ percentage errors) Length (meters) Average voltage (volts) Current absolute error (amps) Current percentage error (%) Voltage absolute error Voltage percentage error (%) 0.100 0.001 0.37 0.240.01 0.24 4.17 % 0.37 0.015 0.37 4.05 0.200 0.001 0.75 0.240.01 0.24 4.17 % 0.75 0.01 0.75 1.33 0.300 0.001

  1. Investigating the effect of 'length' on the resistance of a wire

    Dependant variable * The resistance of the wire. This is calculated by measuring voltage and current. This represents the effect of varying the length of a wire on resistance. Reliability Confidence in the truth of the results I will repeat each reading twice to make sure results are fair and true and then take the average.

  2. To investigate how the temperature affects the resistance of a thermistor.

    wait for the temperature to drop so this is what I am going to do and then from 100C I am going to heat the water bath up again with the Bunsen burner. I discover that the best and most accurate way of getting the resistance measurement is using a

  1. Free essay

    Resistance of a wire

    I will take the average of the 3 results by adding them up and dividing by 3. In the final experiment I found that there may be an equipment error in the power pack causing +- 0.005V fluctuations in the set voltage although this shouldn't affect my experiment as the power pack has a dial function to set the voltage.

  2. The aim of the experiment is to verify the maximum power theorem and investigate ...

    Therefore, we should pay attention to the connection point between the spring balance and the wooden block during the experiment. In addition, beam balance is necessary in the experiment for measuring the masses, which have to be hung at the hanger.

  1. To investigate the effects of two different variables on a solar cell output.

    Obtaining Evidence Experiment 1 results: Current Volts Power Solar Cell Output 1.55 11.55 17.9 51 1.5 10.6 15.9 42 1.4 9.3 13.02 32 1.35 8.65 11.68 26 1.2 7.33 8.8 18 1.15 6.43 7.39 11 1.1 5.62 6.18 8 1 4.63 4.63 4 0.9 3.85 3.47 3 0.8 3.1 2.48

  2. To find which of the circuits, shown below, are most suitable to measure a ...

    + (5 x 10-5) I = 1.5 x 10-4A Therefore the resistance that should be obtained from the meter readings is as follows: R = 16666.67? At the start the resistance I specified on the variable resistor was 25000?. The reading that I calculated above is 8333.33? off this value.

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