# A Wire's Length's Effect Resistance

# A Wire's Length's Effect Resistance

**Length:** 564 words (1.6 double-spaced pages)

**Rating:** Excellent

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Aim:

To find out how the length of a nicrome wire affects the resistance.

Prediction:

The longer the wire the more resistance there will be.

[IMAGE]The atoms in the wire are very close together, because the wire

is a solid. The atoms are made of protons, neutrons, and electrons.

[IMAGE][IMAGE] = atom = electron

[IMAGE]In a long piece of wire there are more atoms so there is less

room for the electrons to get through. The electrons bump into the

atoms and lose some of their energy.

[IMAGE]However in a short piece of wire, there are less atoms. This

means that it is easier for the electrons to move through the wire.

The atoms rub against the electrons, and this creates friction. The

friction also creates heat, which makes the wire hot. If the wire gets

too hot, it will melt.

Diagram:

[IMAGE] Battery

Ammetre

[IMAGE]

[IMAGE] Voltmetre Nichome wire

Method:

[IMAGE] Set up the apparatus as shown in the diagram. Using a metre

ruler, measure out 10cm of nicrome wire. Set up the circuit and take

the readings from the voltmetre and the ammetre. Repeat the experiment

with 20,30,40,50,60,70,80, and 90cm of wire. Work out the resistance

using this equation:

----------------------------------------------------------------------

V= voltage

----------

I= current

----------

R= resistance

-------------

Safety:

-------

Make sure your hands are dry when use electricity. Be careful when

handing the wire as it may get hot. Do not let the wire get too hot or

else it will burn out.

----------------------------------------------------------------------

Fair test:

----------

To keep the experiment fair, I will use the same ammeter, voltmeter,

and power pack, throughout the experiment. To get accurate results I

will use a digital ammeter and voltmeter, and will keep the nicrome

wire the same width throughout the experiment.

--------------------------------------------------------------------

Obtaining evidence

### How to Cite this Page

**MLA Citation:**

"A Wire's Length's Effect Resistance."

__123HelpMe.com__. 25 Jan 2020

<https://www.123helpme.com/view.asp?id=120305>.

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### Related Searches

Length of wire (cm)

Current

Voltage

Resistance

10

0.88

1.83

2.08

20

0.5

2.03

4.60

30

0.36

2.11

5.86

40

0.27

2.16

8.00

50

0.22

2.20

10.00

60

0.19

2.22

11.68

70

0.16

2.23

13.94

80

0.14

2.25

16.07

90

0.13

2.27

17.46

Analysing evidence

==================

[IMAGE]

Above is the graph of my results. It has a steady line which increases

evenly. This is because the resistance is proportional to the length

of the wire. This means that if you double the length of the wire the

resistance is also doubled. When the wire is longer there are more

atoms in it, this makes the electrons take longer to pass through the

wire, creating more resistance. This is shown in the graph as the

longer the wire the more resistance there was.

Evaluation

The results I got were quite accurate, although I had one odd result.

This may be due to taking down the wrong readings from the voltmeter

or the ammeter. Also while measuring the lengths of the nichrome wire,

my measurements might have been slightly inaccurate as the rulers used

might not have been exact. However this should not have affected my

results too much.

To make my experiment possibly more accurate I could have got 3 sets

of results and found an average but this would be too time consuming.

I don't think I could really improve on the way the experiment was

done because my results were quite accurate. I also found that the

experiment was quite easy to set up, as it was simple and

uncomplicated.

Further experiments I could do related to the resistance in a wire

would be to see whether the following factors would make a difference

in the resistance of a wire:

The width: I think that the resistance would be decrease as the wire

got wider, because there would be more room for the electrons to move

through the wire.

Material: if I was to use different wires then the resistance would

change depending on how many atoms were in the wire.