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

Test the resistance of a wire, (nicrome) measured in SWG/mm, to find out if resistance changes as we change the length of the wire.

Extracts from this document...

Introduction

Physics CWK

P- Planning

  • Plan basic experiment
  • Control variables
  • What accurate
  • Make prediction (hypothesis) with scientific information.
  • Evidence of preliminary work.

Outline Plan

In my investigation I will be doing two experiments. The first one will be to test the resistance of a wire when the lengths are altered making sure the area of the wire is kept constant. The second one will be to test the resistance of a wire when the area (diameter) is altered making sure the length of the wire is kept constant. I will have two methods, direct and indirect. The first one (altering the length) I will be using the direct method, where I will be using a multimeter. The second experiment (altering the diameter) I will be using the indirect method, where I will be using an ammeter and voltmeter.

Aim

-Experiment one - To test the resistance of a wire, (nicrome) measured in SWG/mm, to find out if resistance changes as we change the length of the wire.

-Experiment two – To test the resistance of a wire (nicrome) to see if the resistance changes as we change the area of the wire.

...read more.

Middle

35.0cm

03.8

03.6

03.6

03.7

45.0cm

04.6

04.6

04.6

04.6

55.0cm

05.7

05.7

05.6

05.7

AREA (with constant length of 20cm)

Diameter

(cm)

V1

(volts)

V2 (volts)

V3

(volts)

C1 (amps)

C2 (amps)

C3 (amps)

0.027

0.23

0.37

0.88

0.05

0.09

0.21

0.031

0.18

0.34

0.80

0.06

0.11

0.27

0.037

0.12

0.22

0.68

0.06

0.11

0.34

0.045

0.09

0.15

0.58

0.06

0.10

0.40

0.055

0.06

0.11

0.46

0.06

0.11

0.48

*V=Voltage

*C=Current

Calculate resistance…

...read more.

Conclusion

Graph Three – Resistance over 1/area

As the area increases, the resistance goes down, but not at a steady pace. The graph is curved and in a result is not proportional.

I then plotted a graph of resistance over the inverse of the area to make it proportional. It turned out a straight line therefore proving resistance is inversely proportional to the area.

During my experiment, I did not need to repeat any anomalous results because they were between an acceptable margin of error.

E – Evaluation

My experiment went not to badly yet I did struggle with the resistivity. My results came out fairly accurately when I did repeats and came to look at my graphs and final figures.

When averaging out my final results to compare them to the published resistivity, I found one of my final results were very far out. This may hav been because it was the smallest length therefore the current may have been high causing the wire to heat up. When the wire heats up the particles vibrates more. Next time, I will not take readings at 5.0 cm and I will keep the voltage low. I left ths result out when averaging it out

...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

    "h I will be careful when handling live wires. Apparatus: Power Supply Ammeter Voltmeter Thin Constantin wire Meter Ruler Crocodile Clips Connecting Wires I have chosen to use thin constantin wire because from my preliminary results I found that this wire had the highest resistance, because it has the highest

  2. An in Investigation into the Resistance of a Wire.

    Current (A) Resistance V/I (?) 0.085 0.062 1.371 0.106 0.077 1.377 0.128 0.093 1.376 0.142 0.103 1.379 0.161 0.117 1.376 0.173 0.126 1.373 0.192 0.139 1.381 0.228 0.166 1.373 0.250 0.182 1.374 0.284 0.207 1.372 Total 1.375 E34 wire with the length at 15cm Voltage (V)

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

    Therefore, the table should look like the following: Table 1.6.1. Sample results table C.S.A. x mm2 y mm2 z mm2 LENGTH I V Av. I Av. V Av. R I V Av. I Av. V Av. R I V Av.

  2. To find out what happens to the efficiency of a motor as I change ...

    machine is transferred into the useful energy that you are trying to get out. All machines in the real world have an efficiency that is less than 1 (or 100%). In the case of the motor above, part of the electrical energy put in is transferred into the useful movement

  1. An experiment to find how the resistance of a pencil lead varies which the ...

    and 4 batteries (6V). I will keep this experiment a fair test by ensuring that several areas are kept constant: * The area of the pencil lead will be kept the same throughout by taking extra care that the lead doesn't lose any area by being chipped from the crocodile clip's sharp teeth.

  2. Physics Resistance of a wire cwk

    the other will measure the current(ammeter). The multimeter is measured to 3 decimal places which makes my results very accurate. If the multimeter only measured to one decimal place then my results would have not been so accurate. I used this to measure the voltage and current for my results and so I can work out the resistance.

  1. Length vs Resistance

    The longer the wire is, the more the electrons in the wire collide with the fixed atoms in the wire, which increases the resistance because the fixed atoms block the electrons, making it harder for them to travel round in the circuit.

  2. p5 investigation cwk- resistance of a lightbulb

    Method - 1) Collect and arrange equipment 2) Connect Power Supply and add wires from the DC current. 3) Connect a digital ammeter, moving the dial to DCA 10A, and a rheostat to each end of the wire. 4) Add connectors to the end of the digital ammeter and the rheostat.

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