A Wire's Length's Effect Resistance

A Wire's Length's Effect Resistance

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A Wire's Length's Effect Resistance




Planing
=======

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

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"A Wire's Length's Effect Resistance." 123HelpMe.com. 25 Jan 2020
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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.



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