• 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
9. 9
9
10. 10
10
11. 11
11

# In this investigation we are going to investigate the factors affecting the resistance of nichrome wire in an electric circuit

Extracts from this document...

Introduction

Physics investigation

Introduction

In this investigation we are going to investigate the factors affecting the resistance of nichrome wire in an electric circuit

Background Knowledge

The first requirement for conduction is a supply of charge carriers that can move freely through the material. In most solid conductors, notably metals, these carriers are thought to be loosely held electrons. For example, copper has one electron for every atom. The free electrons in a solid conductor are in a state of rapid motion, moving within the crystal lattice at speeds calculated to be around 1/1000 of the speed of light. This motion is normally haphazard (like that of gas molecules) and as many electrons with a given speed move in one direction with the same as in the opposite direction with the same speed. There is therefore no net flow of charge and so no current.

If a battery is connected across the ends of the conductor, an electric field is created in the conductor, which causes the electrons to accelerate and gain kinetic energy. Collisions occur between the accelerating electrons and atoms (really positive ions) of the conductor that are vibrating about their mean position in the crystal lattice but are not free to undergo translational motion. As a result the electrons lose kinetic energy and slow down whilst the ions gain vibrational energy

Electrons move round and round the nucleus in paths called orbits.

Middle

 Independent Variable Dependent Variable Controlled Variable I am going to change the length of wire during this experiment. I am going to measure the resistance of the wire by using ohm’s law. current that we pass through the wire.material of the wire.cross sectional area of the wire.Same room temperature.Same wire used for every test.

Prediction
I predict that if the width increases then the resistance will also increase in proportion to the width. I think this because the thicker the wire the more atoms and so the more likely the electrons are going to collide with the atoms. So if the width is doubled the resistance should also double. This is because if the width is doubled the number of atoms will also double resulting in twice the number of collisions slowing the electrons down and increasing the resistance. My graph should show that the width is proportional to the resistance.
Because the width of the wire is only half the width of the wire below there should be half the number of collisions between the electrons and the atoms. The wire below is twice the width of the wire above and so there should be twice the number of atoms resulting in twice as many collisions and a predicted doubling of the resistance.

List of the apparatus

• Power pack supply of up to 12V
• A full scale deflection ammeter with a measuring range of 0-1
• A voltmeter with a measuring range of 0-5 V
• Circuit wires
• Nichrome wire 0.35m in length
• A meter ruler
• Crocodile clips
• Switch
• Pencil

Conclusion

ass="c3">1.8

1.67

15

3

1.25

1.2

1.25

1.23

2.44

20

3

1.00

1.0

1.00

1.00

3

25

3

0.69

0.69

0.69

0.69

4.35

30

3

0.57

0.58

0.58

0.58

5.17

35

3

0.49

0.48

0.49

0.49

6.12

40

3

0.43

0.42

0.41

0.42

7.14

45

3

0.38

0.38

0.39

0.38

7.89

50

3

0.34

0.34

0.34

0.34

8.82

Safety Precautions

There are not many safety precautions that need to be taken into consideration, in this experiment. The main two I can think of are stated below :

• Do not carry out the experiment in wet areas, as water is a very good conductor, and thus could be very dangerous.
• Do not touch the wire when the circuit switched on, because the current would heat up the wire and it may be extremely hot.
• Keep the voltage at a lowish level so as no-one will be electrocuted

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. ## Resistance Aim: my main aim is to investigate the factors that affect the resistance ...

3 star(s)

the surface will be unimportant in this study because there is no possible way they can be taken into account. There is no way they can alter the results because settings will be the same for each experiment. In this experiment only a direct current will be used.

2. ## Resistance of a Wire Investigation

This lack of accuracy was mainly due to the fact that by simply counting the bubbles, I was relying on each bubble being exactly the same size, which they clearly were not. The preliminary experiment will, however, give me a best fit curve to which I can compare my main

1. ## Physics GCSE Coursework:Factors affecting the resistance of a wire

this means that the electrons will collide with the atoms half the amount of times. Also if the width of the wire was trebled or quadrupled then the resistance would also treble or quadruple, and so on. Therefore my findings and results support my prediction that the width of a wire is directly proportional to its resistance.

2. ## An in Investigation into the Resistance of a Wire.

Cross Sectional Area (m�) � 10-7 Resistance (?) Resistivity (?m) E22 0.30 2.5 0.611 5.1� 10-7 E26 0.30 1.7 0.934 5.3� 10-7 E28 0.30 1.1 1.391 5.1� 10-7 E30 0.30 0.8 1.941 5.2� 10-7 E32 0.30 0.6 2.668 5.3� 10-7 E34 0.30 0.4 3.438 4.6� 10-7 E36 0.30 0.3 5.292

1. ## The Efficiency of an Electric Motor.

To test this I have plotted the power recorded against the voltage I recorded squared. This should give me a straight line in the form In which y=Power recorded, m=1/R, x=V2, c=O since when V=0 P=0 I have also plotted a how the power should vary with respect to the voltage squared for use as a comparison.

2. ## Discover the factors affecting resistance in a conductor.

is applied. The opposition of a conductor to a current is called its resistance. A good conductor has a low resistance and a poor conductor has a high resistance. All conductors resist the flow of electrical charge to a certain degree, however some are better at it than others.

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

The ammeters and voltmeters could have been damaged and reading falsely on both the meters used. Measuring the lengths of the wire is also a inaccuracy as the rulers used are not exact, and it is difficult to get an accurate reading of length by eye, as the wire might

2. ## To investigate the affect of wire width on electric current and resistance.

[image001.jpg] (Electron flow) What is resistance? Resistance is the force opposing the flow of electrons that is current. Resistance in basic terms is the collision of electrons with other particles in the substance through which they are flowing. All conductors supply resistance, thus the quality of a conductor is determined by the amount of resistance it supplies.

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