• 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

# Investigating the Resistance of a Wire when Changing the Length.

Extracts from this document...

Introduction

Investigating the Resistance of a Wire when Changing the Length

Planning

In this experiment, I will be looking at how the length of a wire will affect the size of its resistance. I will do this by measuring the current (using an ammeter) and the voltage (using a voltmeter), and calculating the resistance using Ohm’s Law:

## RESISTANCE = VOLTAGE ÷ CURRENT

(       )              (V)               (A)

To make this investigation a fair test, (by which I mean an experiment where only one variable is changed, and the other(s) stay the same), I will only change the length of the Constantine wire, with a Standard Width Gauge of 36. I will keep the voltage constant, at 2 Volts, and I will measure the current, to determine the resistance using Ohm’s Law.

I have chosen not to change the voltage, because if the voltage is set too high, then it may cause the wire to heat up, and this will give the wire more energy. If the wire has more energy, then it could cause the electrons to move quicker, and the resistance will be lower, by no cause of the rise in Voltage.

The apparatus I will use will be a 1-metre length of Constantine wire, numerous other crocodile clips and electric wires, a metre long ruler, an ammeter, a voltmeter and a Power Supply.

...read more.

Middle

0.45

2

30

0.35

2

35

0.30

2

40

0.27

2

45

0.25

2

50

0.21

2

55

0.20

2

### Current and Voltage Reading Set 3

 Length of Wire (cm) Current (A) Voltage (V) 10 1.05 2 15 0.71 2 20 0.55 2 25 0.45 2 30 0.36 2 35 0.31 2 40 0.27 2 45 0.25 2 50 0.21 2 55 0.20 2

### Current and Voltage Reading Set 4

 Length of Wire (cm) Current (A) Voltage (V) 10 1.00 2 15 0.70 2 20 0.55 2 25 0.45 2 30 0.38 2 35 0.31 2 40 0.27 2 45 0.25 2 50 0.21 2 55 0.20 2

### Current and Voltage Reading Set 5

...read more.

Conclusion

When I worked out in my experiment what the resistance of 1m of Constantine wire is, it was different to that on the Focus on Science program. This could be down to many things I mentioned earlier during the Evaluation. When they did their experiment, they would have made sure that there would be no other factors effecting resistance, but in mine, this would not have been possible because I did not have the facilities to.

#### On the whole, the graph of average resistance follows the pattern that I expected it to, but with a chance, I would like to do it again, and hopefully get a better graph out of it. If I could do it again, I would like to, because I could see if my experiment was correct, rather than seeing what problems there were in getting the results out of it.

Ryan Edwards

...read more.

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. ## How does length and width affect resistance

The results therefore are reliable. The curve of best fit shows that there aren't any anomalous results therefore I did not have to repeat the experiment. My predication stated that The thinner the wire, the higher the resistance. The thicker the wire, the lower the resistance. My hypothesis was correct.

2. ## An investigation into the effect of changing the length of a wire on the ...

According to Ohm's law, as the potential difference is increased a greater current flows. But, some materials put up more resistance to the flow of current than others. Materials such as copper have little resistance to the flow of an electric current and are ideal for wiring electric circuits.

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