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# What affects the resistance of a piece of wire?

Extracts from this document...

Introduction

## What affects the resistance of a piece of wire?

I have decided to measure 10 different lengths of 1 piece of wire, 3 times each so it would be a fair test. Also I am keeping the thickness and the material the same also so it will be a fair test.

I am going to measure the current and voltage of different lengths of the wire and then calculate the resistance by dividing the voltage by the current. I will do each length 3 times and use the average.

Above is my series circuit

Safety:

There are not many safety factors that you need to take in on this particular experiment.

One thing though don’t use a power pack instead use batteries otherwise the wire will get red hot and you can burn yourself unlike with the batteries the wire does not have so much electricity running through it.

Middle

0.26

9.61

2.47

0.26

11.2

2.40

0.26

9.23

10.01

60CM

2.54

0.22

11.54

2.51

0.22

11.4

2.46

0.22

11.1

11.34

70CM

2.57

0.19

13.52

2.53

0.19

13.3

2.50

0.19

13.1

13.30

80CM

2.61

0.17

15.35

2.57

0.17

15.1

2.52

0.17

14.8

15.08

90CM

2.64

0.15

17.6

2.59

0.15

17.2

2.54

0.15

16.91

17.23

100CM

2.66

0.14

19

2.66

0.13

20.4

2.57

0.13

19.7

19.7

Below are the results I will be using to plot my graph

#### AVERAGE

Conclusion

We could do other experiments such as using different wires but keeping the length the same or different thickness.

My prediction for this experiment I would say would be: as the wire gets thicker the resistance is lower.

The resistance of a circuit is a measure of how easily electrons flow through it. Most metals are good conductors of electricity, and have low resistances. The resistance of a wire decreases as it becomes thicker and increases with length. Resistance is measured in units called ohms.

### OHMS LAW

Ohms law was named after Mr. Georg Ohm he was a mathematician and physicist born 1789 died 1854.

Ohms law defines the relationship between voltage, current and resistance.

The principals are to apply a.c., d.c., r.f. this is radio frequency.

He discovered that when you added voltage to resistance then current would flow and power would be made.

The formulas are:

E= volts

I=current

R=resistance

Voltage= [E=I*(x) R]

Current= [I=E/R]

Resistance= [R=E/I]

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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