• 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

# Investigate the effect the thickness of wire has on it's resistance.

Extracts from this document...

Introduction

Rosie Higgins                                19/11/01

## PLANNING

Aim: To investigate the effect the thickness of wire has on it’s resistance.

Equipment:

Nickel Chrome Wire cut into 10 pieces of 30cm length (Ruler, Pliers)

Two crocodile clips

Five Pieces of Wire

Power Source

Variable Resistor

Ammeter

Volt Meter

## Method:

• The Circuit was set up as in the circuit diagram overleaf with a power source of 5 Volts, an ammeter, crocodile clips (holding wires), and a variable resistor in series and a Voltmeter in parallel with the wires.
• Nickel chrome wire was then measured to discover the cross section width with a micrometer screw gauge and this was recorded and the cross sectional areas was calculated using πr² multiplied each time by the number of wires used, each bit of wire was cut into lengths of 30 cm
• The crocodile clips held one piece of nickel chrome wire of thickness 34 mm and length 30 cm at the same point on the ends of the wire.
• The power source, ammeter and voltmeter were then switched on.
• The voltage and current for the wire were then recorded, and recorded again when the variable resistor’s slider was moved to the middle and again when the slider was moved to the end.
• The Power was turned off while another was added to avoid overheating.
• Another wire, or exact same properties (Nickel Chrome, thickness 34 mm and length 30cm) was placed on top of the previous wire, in the same position, both straight and flat.
• The Power was turned on again and the same procedure was repeated, recording current and voltage at three points on the variable resistor.
• This was repeated 10 times in all, each time, an extra wire of exact same properties (Nickel Chrome, thickness 34 mm and length 30cm) was placed on top of the previous wire in the same position, all straight and flat and the current and voltage was recorded at three points on the variable resistor.
• The resistance was then calculated using the formula R =V/I (resistance equals voltage (v) over current (a)) for each thickness of wires, three times and

Middle

## Measures to ensure a fair test

Certain measures were taken to ensure that the results were as accurate as possible. Therefore, the wire was kept consistent, it was always Nickel Chrome which had the presumably had the same cross section width and was cut into the same length to prevent the length affecting resistance. The same equipment was used and the same voltage (5 volts) was used for each. Therefore the only variables were the number of wires and the position on the variable resistor. The crocodile clips have to keep the wire at the same length and hold all the wire at the same point to make it a fair test.

## Hypothesis

The resistance will be lower the thicker the wire (more wires) because resistance is lower with a cross sectional surface area.

This is as, as the wire gets thicker the electrons in the wire have more room to flow, resistance will become lower and current will flow more easily. If the wire is a good conductor the resistance will be lower. The higher the resistance, the lower the current. I already know that the when the cross sectional area of the wire is increased, the resistance decreases as in a previous experiment involving a bulb, the bulb brightened when I doubled over the wire (increased the cross sectional area). I know that altering the variable resistor would vary the current and voltage. Resistance will be greater the greater the current.

ANALYZING

Conclusion

The evidence, though it gives the basic link between the thickness of wire and resistance, it is not always reliable as certain elements cannot be controlled such as room temperature which may not remain constant during the experiment (especially if, as I did the results were gathered on different days and at different times on those days) and overlooking things which may in some way alter the results. For example, the cross sectional area of the wire was just measured once and is quite likely to be inconsistent along the wire. The conclusion is likely to be correct though could be more detailed if the investigation was taken further.

There are roughly no anomalies and I have received incredibly accurate results, allowing me to form an excellent line of best fit..

To further the investigation

To further the investigation, these results could just be seen as a starting point and other variables could be changed to investigate the effects of different conditions on the resistance. Temperature (of room), length of wire, types of wire (instead of using just nickel chrome, the experiment could be repeated each time but with different wires and investigate their resistance in relation to mass or thickness), voltage etc. could all be changed to investigate the effects and they could all be recorded as the effects on resistance.

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 and Wires

Heat is produced using energy from the electrical current. This causes the overall resistance to increase because there is energy being taken from the electrical current. These results show that a thicker wire has a much smaller resistance than a thinner wire. This preliminary data supports my initial prediction which stated that thinner wire will have more resistance than thicker wire.

2. ## How The Thickness Of A Wire Effects The Wires Resistance.

To measure the wire width I would use different widths of the same length and same material of wire e.g. thin, medium and thick wire. 4.Wire width: If the wires width is increased the resistance will decrease. This is because of the increase in the space for the electrons to travel through.

1. ## To alter the length of wire and measure the effect on the resistance.

Width of wire The width will be measured in swg (single width gage). 28 the thickest wire 30 36 the thinnest wire Thick wires let the electric current through easily than thin wires. e- Thin wire - Not much space, high resistance e- When the electrons try to move they

2. ## In our experiment we aimed to investigate the effect of the length of wire ...

The crocodile clips which were connecting the wire started by being 1cm apart while attached to the wire, and then after we had taken the measurements we slid the clips along the wire until they were 2cm apart, and so on. 8. We then went back to step one.

1. ## The effects on resistance with the variables of length and thickness.

Research and scientific knowledge Resistance It is a property of a substance that restricts the flow of electricity through it; it is associated with the conversion of electrical energy to heat also the magnitude of this property. Resistance depends on many factors, such as the nature of the material like;

2. ## Describe how you would investigate the properties of a piece of wire so as ...

If the cross sectional area of the wire is increased the resistance will decrease this is because of the increase in the space for the electrons to travel through. Due to this increased space between the atoms there should be fewer collisions.

1. ## Factors Affecting The Resistance (Thickness)

* Be careful with all equipment. * Do not touch wires which are either split or have no plastic casing when they are connected to a power supply. Fair Test: Temperature must be constant. You can't do half the experiment one day then do the rest the next day because the temperature may have changed dramatically.

2. ## Investigating resistance when altering thickness of wire / length of wire

The other variables (temperature, material and voltage) will have to be kept constant in both experiments to make sure that only length, thickness and resistance are investigated. In experiment 1 the same bit of wire and the same thickness need to be kept constant.

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