• 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

    The spread of electric energy in the form of heat, even though small, affects the amount of electromotive force, or driving voltage, required to produce a given current through the circuit. In fact, the electromotive force V (measured in volts)

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

    energy, however, the machine also transfers it's energy into two other waste forms: it creates a little heat and a little sound, caused by the force of friction on it's moving parts, as in all machines. The greater the proportion of energy supplied to a device, that is usefully transferred, the more efficient the device.

  1. To see how the length of a wire affects its resistance. To find the ...

    Experiment Independent Variable Controlled Variables Dependant variable 1 Type Of Wire: Constantan, copper, Nichrome and Manganin Length, Thickness, Temp, Voltage, Wires connected to battery pack We will find the voltage and current and use this information to find the wire with most resistance out of the four.

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

    This severely reduces the probability of an electron passing through the gaps between the atoms without colliding and losing electrical energy. Similarly, if you reduce the temperature, the vibrations become less, therefore giving the electrons a larger space, and more time to pass through.

  1. Length vs Resistance

    The current cannot be allowed to go above 1A because if it went above it, it would cause the wire to heat up and eventually start glowing or burning, which would damage the wire. As well as this, there was one outlier in the data, which may have been caused

  2. My aim is to find the change in resistance as a current is passed ...

    less resistance. APPARATUS. In order to carry out this experiment I needed the following: > Power Pack ~ to measure voltage > Connecting wire ~ allowing electricity to pass through up to the testing wire and back to the power pack > 10 pieces of wire of different lengths and

  1. Investigating resistance when altering thickness of wire / length of wire

    Resistance= 1/Area. This can be explained using the formula R = V/I where there is 2X the current, and the voltage is the same, therefore R will halve. I did some research and in a book called 'Ordinary Level Physics' By A.

  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.

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