• 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

# What affects the resistance Of a piece of wire?

Extracts from this document...

Introduction

Marcus Connell 10a1 Mr. Hales Science Physics Coursework What affects the resistance Of a piece of wire? Aim: To find out what affects the resistance of a wire. Introduction: Resistance is the ratio of the potential difference (or voltage) across a conductor to the electrical current. This formula displays this and shows how to work out the resistance: R=V / I Resistance=Voltage / Current Resistance is measured in Ohms (symbol O) as the resistance between two points on a conductor with a constant one-volt potential difference that in turn creates a current. It is named after Georg Simon Ohm , a German Physicist between the years 1787-1854, who also created Ohm's Law in which a metal conductor that if at a constant temperature its value(resistance) stays the same regardless the current but the value will rise if the temperature rises. A resistor can be used in a circuit that is an electrical device that opposes electrical current flow. Electricity can only flow through materials called conductors, such as copper, as their electrons are free to move within the wires to create a current. ...read more.

Middle

Amps A 70.0 0.91 0.93 0.94 65.0 0.98 1.01 1.01 60.0 1.03 1.03 1.04 55.0 1.16 1.06 1.08 50.0 1.28 1.30 1.28 45.0 1.36 1.38 1.40 40.0 1.45 1.58 1.48 35.0 1.80 1.67 1.80 30.0 2.10 2.01 2.02 25.0 2.40 2.48 2.48 20.0 2.90 2.79 2.80 15.0 3.80 3.86 3.50 Measurement (cm) R=V/I R=V/I R=V/I Average resistance 70.0 2/0.91=2.20 2/0.93=2.15 2/0.94=2.13 2.16 65.0 2/0.98=2.04 2/1.01=1.98 2/1.01=1.98 2.00 60.0 2/1.03=1.94 2/1.03=1.94 2/1.04=1.92 1.93 55.0 2/1.16=1.72 2/1.06=1.89 2/1.08=1.85 1.82 50.0 2/1.28=1.56 2/1.30=1.54 2/1.28=1.56 1.55 45.0 2/1.36=1.47 2/1.38=1.45 2/1.40=1.43 1.45 40.0 2/1.45=1.38 2/1.58=1.27 2/1.48=1.35 1.33 35.0 2/1.80=1.11 2/1.67=1.20 2/1.80=1.11 1.14 30.0 2/2.10=0.95 2/2.01=1.00 2/2.02=1.00 0.98 25.0 2/2.40=0.83 2/2.48=0.81 2/2.48=0.81 0.82 20.0 2/2.90=0.69 2/2.79=0.72 2/2.80=0.71 0.71 15.0 2/3.80=0.53 2/3.86=0.52 2/3.50=0.57 0.54 Fair Test: To make this experiment a fair test I will make sure: * The Voltage stays the same. * The same power is used. * The temperature stays the same * The material stays the same * The thickness/X-Area of the material stays the same. * It is tested for the same amount of time. Safety: To ensure safety in my experiment I will: * Keep the power low. ...read more.

Conclusion

* Keep the wire cool all the way through the experiments, as heat is also another variable in the resistance of the wire. The evidence/results I have obtained from my tests are mostly accurate though there are a few anomalies that have arisen in the data. These anomalies have appeared due to a couple of reasons to do with my experiments such as temperature not being controlled throughout all the tests. Black oxide was left on the wire, from heat that affects the resistance-gives atoms more energy to travel quicker and the ammeter could have been judged in a way (wrong data read) that gave unreliable results. My evidence is very reliable as experiments were repeated three times and an average was taken the voltage and temperature was kept fairly constant and our results matched those of the rest of the class and the same logic and theories could be taken from my results. The measurements and amps were taken accurately using specific apparatus (knives) in order to achieve these reliable results. Science Physics Coursework What affects the resistance Of a piece of wire? Marcus Connell 10a1 Mr. Hales ...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. ## Finding a material's specific heat capacity

(� 0.21%) (� 0.40%) (� 0.08%) (� 0.98%) (� 0.98%) 0 13.2 11.6 0 0 0 30 14.1 11.6 1008 0 1008 60 16.3 11.7 1895 121 1774 90 18.3 11.7 2903 121 2782 120 21.5 11.7 3912 121 3791 150� 24.9 11.7 4920 121 4799 180 26.5 11.7 4926

2. ## An experiment to find the resistivity of nichrome

Density Density has a large affect on the amount of resistance. The resistance depends upon the amount of denseness e.g. a large surface area has less resistance because a small area has tightly packed atoms which in turn rebound many of these electrons.

1. ## What Affects The Resistance Of A Piece Of Wire?

The resistance of a wire at constant temperature depends on its dimensions, and the material from which it is made. Every material has a property called its resistivity (p). It is measured in ohm metres (? m). The higher the resistivity, the harder it is to charge flow through the material.

2. ## Resistance - My aim in this piece of investigative work is to take one ...

I also found out that for safety I should use low amps because otherwise the wire becomes very hot to touch and could burn. What do I need to measure and how? So I need, from my circuit to take the voltage and the current.

1. ## To investigate how current affects the resistivity of a wire.

and took nine measurements, starting on 20cm and going up by 20cm each measurement, up to 200cm. However, I noticed that between some of the readings there were big gaps for the resistance and the current and resistance and thus I have decided to measure the length of the wire

2. ## What affects the resistance of a piece of wire

the longer it will take for the electrons to get to the end. This is because there will be more collisions between the electrons and atoms. So the length of the wire would be proportional to the resistance. Overall these factors are linked by the formula R=P L/ A The factor, which I will investigate, will be length.

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