• 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

# What variables affect the resistance of a piece of wire?

Extracts from this document...

Introduction

James Griver April 2001 What variables affect the resistance of a piece of wire? PLAN Aim: - To experiment whether the length of a piece of Nichrome wire affects the resistance in a circuit containing two batteries, a voltmeter, and an amp meter. Equipment List: - * 7 x connector wires * 1 x nichrome wire at varied lengths * 2 x 9V Battery * 1 x Variable Resistor * 1 x Ammeter * 1 x Voltmeter Method: - A circuit will be set up as shown below: Prediction: - In the experiment, I predict that the longer the length of wire, the higher the resistance is going to be. This prediction is made because the electrons travelling through the wire have a higher chance of colliding with the wire's particles stopping the natural flow of current. ...read more.

Middle

The recordings will be taken with values to two decimal places each time. OBTAINING EVIDENCE Results: - Reading # 1 2 3 4 5 Length V I V I V I V I V I 200mm 0.72 0.20 0.57 0.16 0.41 0.11 0.32 0.09 0.26 0.07 400mm 0.98 0.14 0.75 0.11 0.60 0.09 0.51 0.07 0.42 0.06 600mm 1.11 0.11 0.87 0.08 0.72 0.07 0.66 0.06 0.54 0.05 800mm 1.14 0.08 0.91 0.06 0.79 0.05 0.74 0.05 0.63 0.04 1000mm 1.15 0.06 0.99 0.05 0.88 0.05 0.80 0.04 0.71 0.04 Reading # 1 2 3 4 5 Average Length R ? R ? R ? R ? R ? R ? 200mm 3.60 3.56 3.73 3.56 3.71 3.63 400mm 7.00 6.81 6.67 7.29 7.00 6.95 600mm 10.09 10.88 10.29 11.00 10.80 10.61 800mm 14.25 15.17 15.80 14.80 15.75 ...read more.

Conclusion

The length of the wire is directly proportional to the resistance. To ensure further accuracy, there are certain things that could be changed in order to obtain better results: > Take a wider set of results. Possibly twice as many, then work out the average. > To further experiment on what factors affect the resistance of a wire, I could have tested the three other variables - the cross-section, the material and the temperature. > The experiment could have been carried in a controlled environment, allowing the temperature to remain constant and allow a fairer test. > The wires used in the circuit contain a certain resistance, therefore certain wires with less resistance could have been used. Information for this coursework was taken from Encarta '98, Physics Matters by Nick England, and GCSE Physics by Richard Parsons. ...read more.

The above preview is unformatted text

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

# Related GCSE Electricity and Magnetism essays

1. ## &amp;quot;Are rechargeable batteries more economical than alkaline batteries?&amp;quot;

9 Hours 95% 490 Mins ThirdTrial: Battery Type Price / Pack Charge Rate Strength Duration BIG Alkaline 1500mAh \$30 (4 Packs) & Charger 14 Hours 95% 540 Mins DickSmith NiCad 1000mAh \$5.98 Each 15 Hours 95% 520 Mins Dick Smith NiCad 600mAh \$3.98 Each 9 Hours 95% 490 Mins Observations:

2. ## &amp;quot;What variables can affect the resistance of a piece of wire?&amp;quot;

The longer the wire the more atoms there are therefore the more chance of a collision, thus increasing resistance. Temperature: Quantitative Prediction: - Usually the higher the temperature the greater the resistance. The greater the temperature, the more energy the atoms gain therefore the more vibration there is.

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