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What affects the resistance Of a piece of wire?

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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.

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