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How does the length of wire affect the resistance of the wire?

Extracts from this document...

Introduction

KAJAL GONDALIA 10A

RESISTANCE COURSEWORK

AIM:How does the length of wire affect the resistance of the wire?

PREDICTION: I think that longer the wire will be the more resistance there would be. I thinak this because if the wire were longer it would be easier for more electrons to pass through. This is because there are many particles in the wire pushing back the electrons from entering the wire but in return the electrons would struggle through and cause high pressure and high resistance. If there is high resistance then this will show me that there are many electrons in the wire and there are many collisions taken place between the electrons and the atoms.

I think my results will show me, as there is high resistance there would be high voltage to push the current through a wire. So the more resistance there is, the more voltage there is, which results to having less current to pass through in the wire.

EXPLANATION:Resistance is in every material. It acts like a force, which prevents the flow of current.

In a wire, electrons pass through for the flow of current. As electrons pass through a wire it collides with particles such as atoms. The electrons hit against the atoms causing collisions to occur. This then slows down the current from flowing through

Middle

RESULTS:

 POWER SUPPLY=2VOLTS LENGTH OF WIRE(CM) 100 80 60 40 20 VOLTAGE= NO SELOTAPE 2.01 1.9 1.8 1.79 1.55 SELOTAPE 1.97 0.98 1.9 1.77 1.53 AMPS=      NO SELOTAPE 0.29 0.39 0.49 0.59 1.18 SELOTAPE 0.31 0.4 0.5 0.7 1.21 RESISTANCE=NO SELOTAPE 6.93 4.87 3.67 3.05 1.31 SELOTAPE 6.35 4.95 3.8 2.52 1.26
 POWER SUPPLY=4 VOLTS LENGTH OF WIRE(CM) 100 80 60 40 20 VOLTAGE= NO SELOTAPE 4.05 3.98 3.96 3.75 3.34 SELOTAPE 4.12 3.96 3.89 3.61 3.09 AMPS=       NO SELOTAPE 0.71 0.79 1.06 1.45 0.42 SELOTAPE 0.66 0.8 1.07 1.55 1.53 RESISTANCE=NO SELOTAPE 5.7 5.03 3.7 2.58 1.38 SELOTAPE 6.24 4.95 3.63 2.32 2.01

Conclusion

As you can see, from my graphs, that I got a number of anomalous points. This can be avoided if I had a specific time difference between each time I recorded the resistance of the wire for each length of wire. This is because when I did my experiment I recorded all the resistances one after the other, and the wire got quite hot because there was high resistance flowing across it. If I waited for about 5 minutes between each recording of resistances, I could see a difference between the temperatures of the wire and how high or low the resistance would be. This is because as you increase the temperature you get high resistance and if you don’t leave a time gap in between the next recording you do of the resistance, the wire would still be hot and this would effect on how high the resistance would be and it would not show you a variety of results because they would all be similar to one another, because the wire would be hot and would still have its previous resistance adding to the new resistance of the wire. As for low temperature, it would result to low resistance and this would be more efficient because it gives a more clear picture of the way resistance increases and decreases, but also reduces the amount of anomalous points.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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