A Wire's Length's Effect Resistance
Planing
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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:
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V= voltage
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I= current
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R= resistance
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Safety:
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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.
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Fair test:
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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.
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Obtaining evidence
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