• 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

# My aim is to observe whether the length of a nichrome wire affects its resistance.

Extracts from this document...

Introduction

Resistance of a Wire Investigation

AIM

My aim is to observe whether the length of a nichrome wire affects its resistance.

PREDICTION

Based on my scientific knowledge, I feel that the shorter the length of wire, the less resistance there will be, and vice-versa – the longer the length of wire then the more resistance there will be. I have based this prediction on the knowledge that when the wire increase in length, the more current will be required, therefore decreasing the current and increasing the resistance. Another reason for my prediction is that when electrons are in the circuit, they are forever losing energy. While going through a longer wire and longer circuit then the electrons will lose energy and more will be sent, creating yet more resistance.  I hope my graph for the experiment to look like this:

I also carried out a run-through of the test in a preliminary investigation and I found that the resistance does increase with the length of wire.

Middle

CHANGES FROM TRIAL EXPERIMENT

While trialling the experiment I felt that the following changes needed to be made:

• Measure at 10regular intervals instead of the original 5 – it will ensure that I will get a better average.
• Use sellotape to stick wire to ruler – stop wire become twisted and keep it straight on the ruler.
• For the shorter lengths of wire, the power pack must only be on for a matter of seconds, due to the lack of wire needing to get through, the particles will build up and melt the wire.

METHOD

• Measure a piece of 0.25mm nichrome wire to 100cm
• Connect all components together using crocodile clips
• Attach the wire to the ruler, using Sellotape.
• Switch the power unit onto 6 volts and onto a direct current, I only want the current to be flowing one way and not alternating.
• Measure 10cm on the ruler, turn the P.S.U. on and take the reading on the ammeter and voltmeter. I will do the same for 20cm, 30cm, 40cm etc. Before repeating the process again, twice for all 10 measurements.
• Use the formula, RESISTANCE = VOLTAGE

Conclusion

If I did the investigation again, I wouldn’t be able to use a resistor, which would defeat the point of the experiment. I’m not sure how I’d tackle this problem. I could also have used a digital voltmeter instead of an analogue one because the analogue one would be a lot less accurate than a digital one. I feel the analogue one is less accurate because I would have had to read the meter manually with my whereas a digital one would have given a much more detailed reading. I could also change a variable, which would see the problem from a different perspective; I could look at the thickness of the wire or the voltage at which the power pack is set. This would give me more data to work with, on top of the set of results in this experiment.

In conclusion, I feel this experiment was quite successful although more tests mean a more accurate result.

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)

Even if the experiment is to be repeated numerous times, the result would still not be able to be understood as precisely accurate. The performance of the equipment was suitable. The equipments worked well enough to give an accurate answer but with limits.

2. ## Find whether the length of a wire affects its resistance.

The filament has fewer conducting electrons than the same length of connecting wire and so the charge has to move faster to maintain the same rate of flow, or current. This leads to the filament being heated as the electrons transfer their energy in collisions with the metal particles.

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

The other three readings have almost the same inaccuracy, an average of 10%, which again, is fairly accurate. The inaccuracy could have been because of the wire coming from a different manufacturer to the predicted results, as there is some discrepancy between the amount of copper and nickel in different brand's wire.

2. ## Investigation: How length affects the resistance in a wire.

"ƒigÿ!i""#"ƒigÿ\$i%"&"'(")"*+",ÿÚ""Å½""ø"FD ________________ ",c"Ô”"|¾"8c "|¾ " ________________ " " ""8âÿ?ÿâ """"""ÿÿÿÿ "ƒigÿ!i""#"ƒigÿ\$i%"&"'(")"*+",ÿÚ""ù""h"¢ ",c"Ô”"|¾"8c "|¾ " ________________ " " ""8âÿ?ÿâ """"""ÿÿÿÿ "ƒigÿ!i""#"ƒigÿ\$i%"&"ƒigÿ'i(")"*+",ÿ ________________ "Ú""‡""ò"°Å½ ________________ ",c"Ô”"|¾"8c "|¾ " ________________ " " ""8âÿ?ÿâ """"""ÿÿÿÿ "ƒigÿ!i""#"ƒigÿ\$i%"&"'(")"*+",ÿÚ""ó""\"FD ________________ ",c"Ô”"|¾"8c "|¾ " ________________ " " ""8âÿ?ÿâ """"""ÿÿÿÿ "ƒigÿ!i""#"ƒigÿ\$i%"&"'(")"*+",ÿÚ""]""Â",Ò ",c"Ô”"|¾"8c "|¾ " ________________ " " ""8âÿ?ÿâ """"""ÿÿÿÿ

1. ## The aim of this investigation is to discover how the length of a wire ...

This makes the atom vibrate more - and we see this as the wire becoming hotter! > Material: The type of material of the wire will affect the amount of free electrons, which are able to flow through the wire.

2. ## See whether the length of a wire affects its resistance.

slid my rheostat halfway then once again recorded the reading then repeated with the rheostat on full after this I turned off the power then repeated these 3 steps 6 more times up to 70 cm. once I had done the experiment 3 times with all of my recorded results,

1. ## Find out whether the length of the wire affects the resistance in a circuit.

I predict that the resistance in the circuit will go up steadily as the length of the wire increases. My prediction graph shows what I predict the resistance will increase as the length increases. This is because there will be more atoms for the flowing electrons to bump into, therefore

2. ## Molecular stability (rheology) of a plastic carrier bag through stress - strain tests.

Calculating stress To calculate the stress I need to use the formula: Stress = Load Area of cross section First I need to calculate the area of the cross section. To do this I shall use the formula: Area = width ?

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