• 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

# Factors that affect the resistance in a wire

Extracts from this document...

Introduction

Science Coursework

Physics

Factors that affect the resistance in a wire

Introduction

I shall look at various factors which can affect the resistance of a wire and investigate one of these in greater detail. I shall start off with theory on resistance and use it to make a prediction and then plan and carry out an experiment to obtain enough evidence to prove or disprove my prediction. From my data I shall plot graphs. I shall finish off by looking at errors and inaccuracies in my experiment and suggest improvements.

Theory

An electric current is the flow of electrons through a conductor. As these flow through the wire they encounter obstacle molecules, which are found in side the wire, and if they collide with these molecules they pass their kinetic energy to the obstacle molecules causing them to vibrate even faster than before leading to the heating up of the wire and the electrons loose their kinetic energy and slow down; thereby reducing the current flow.

If the cross section (thickness)

Middle

1) Find the most suitable wires to use and the most suitable voltage from the power

pack to use

2) Connect the wire that is to be tested to the circuit and switch on the power pack to    volts

4) Repeat steps 2) and 3) for each wire 3 times to reduce experimental errors

5) Once experiment is complete disconnect all equipment

6) Work out the resistance from my readings off the ammeter and voltmeter

7) Plot graphs and analyze my results.

Results

Conclusion

rd test got the highest resistance of 5.1, or bends on the wire may of caused the second test to get the lowest resistance of 2.9.  There were some other odd results as for the wire with 0.8mm squared varied from 18.2 to 22.5 which could have been caused by slight mistakes in my readings from the ammeter and voltmeter.

I could have improved my experiment had I left the wires to cool down before taking the next set of results or made sure that there was no bending in the wire. I could have obtained more data by collecting data from other groups doing the same experiment and averaging them and I could have carried out the experiment with an even wider range of thicknesses, but overall I felt that experiment provided enough, reliable results to prove my prediction correct.

By Omer Tarmohamed 11QU

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

voltage differed and a rough estimate of the results shown had to be displayed. Therefore if I were to repeat the investigation I would avoid using the voltmeter and ammeter, but just use the multimeter. One problem I encountered in the multimeter graph was that the line of best fit did not pass through the origin.

2. ## Resistance and Wires

This is not because the idea is the error, but because the reading of the data is in error. When reading the results from the graph I rounded each reading to the nearest single figure. This meant that particularly towards the ranges which included thicker diameters, the results did not follow an exact pattern.

1. ## Investigate the factors That Affect the Flow of Electricity Through a Conductor.

The voltage/current is constant? Variables: There are a number of variables I can alter in this experiment that will theoretically alter the flow of current through a conductor. However, I am only going to concentrate on one variable, as this will allow me take make a more detailed conclusion.

2. ## Planning Experimental Procedures

The power point will supply 4 volts direct current constantly around the current. 2. Set apparatus up as shown: 3. Experiment with the Nichrome first, test each length of the wire and record down the results from digital ammeter 1, analogue ammeter 2 and digital voltmeter 1.

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