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# The aim of this assessment is to investigate the factors that will affect the resistance of a length of wire.

Extracts from this document...

Introduction

Assessment

Aim

The aim of this assessment is to investigate the factors that will affect the resistance of a length of resistance wire.

Factors

• Length of wire
• Thickness of wire
• Temperature-We can’t do this factor because it is very hard to control and measure, also the resistance doesn’t change until the wire gets red hot.
• Type of wire-The school only has two types of wires, Constanton and Nickrome, we haven’t got a good selection of wires to choose from so we can’t do this factor.

Method for Length

To calculate the resistance,

We are using the equation;

A

R=V

A

To start of with, you set up the equipment as shown in the diagram.

• Check that the circuit is in working order by putting a resistor in that you know the resistance of, and use the equation to calculate the resistance.
• The resistance wire is to be cut at 50cm.
• Take the readings off the Volt and Amp metres.
• Record results in an appropriate results table.
• Repeat once more with a fresh piece of wire, so you can take an average.
• Do a minimum of seven different lengths, using the same wire withn the same thickness.

Middle

V

• To start of with, you set up the equipment as shown in the diagram.
• Check that the circuit is in working order by putting a resistor in that you know the resistance of, and use the equation to calculate the resistance.
• The resistance wire is to be cut at 40cm.
• Take the readings off the Volt and Amp metres.
• Record results in an appropriate results table.
• Repeat once more with a fresh piece of wire, so you can take an average.
• Do a minimum of seven different thicknesses, using the same type of wire.

Theory of Electricity

An Atom is composed of positively charged particles and much smaller negatively charged particles called electrons.  The protons form the center of the atom, while the electrons whirl in an orbit around the proton center, much likes the moon orbits around the earth. If there were multiple earths very close together, and they each had a moon, they could play a game of catch, passing the moons from one earth’s orbit into the next earth’s orbit.  But the laws of our game require that each earth has one moon in orbit around it.  If an earth didn’t have a moon in orbit, having just passed it, it would have a positive charge on it, and desires to have a moon.

Conclusion

pan>

0.54

12.26

3.12

0.28

11.14

11.7

30

2.94

0.4

7.35

6.51

0.9

7.23

7.29

 Length(cm) 170 150 130 110 90 70 50 30 Average V/A 37.25 31.405 27.73 24.98 19.98 15.53 11.7 7.29
 Thickness(mm) V1(volts) A1(amps) V1/A1(ohms) V2(volts) A2(amps) V2/A2(ohms) Average V/A(Ohms 0.2 3.02 0.41 7.36 6.83 0.94 7.26 7.36 0.236 3.24 0.66 409 6.36 1.3 4.89 4.895 0.28 3.03 0.86 3.52 6.17 1.76 3.5 3.51 0.315 2.71 1.04 2.6 5.77 2.13 2.7 2.65 0.375 2.61 0.43 1.82 5.37 2.96 1.81 1.815 0.45 2.38 0.89 1.25 4.4 3.49 1.21 1.23 0.56 2.01 2.29 0.87 3.99 4.9 0.84 0.855
 Thickness(mm) 0.2 0.236 0.28 0.315 0.375 0.45 0.56 Average V/A(Ohms 7.36 4.895 3.51 2.65 1.815 1.23 0.855 1/Thickness 5 4.237 3.571 3.175 2.67 2.22 1.786

Conclusion for Length

In the experiment for length, How does the Length of a wire affect the resistance, I found that my results show that the longer the wire is in length then the higher the resistance.

Length graph

Conclusion from Graph

In my prediction, I stated that:

1. When the length of the conductor was increased, the electrical resistance will increase.
2. The resistance was directly proportional to the length e.g. When the length is doubled, the resistance is doubled, and when the length is tripled, the resistance is tripled.

These points are proven by this graph because it is a straight line which means that the resistance is directly proportional to length.

Conclusion for Thickness

In the experiment How does the thickness of a wire affect the resistance of a wire, I found that my results showed me that the resistance is affected by the thickness of a wire, when the wire has a bigger diameter then the resistance is much lower.

Thickness graph

Conclusion from Graph

There was an unexpected result on this graph. I expected it to be a straight line so that the resistance was directly proportional to one divided by thickness. But as you can see it has come out as a curved line.

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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