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Factors Affecting the Resistance of a Wire.

Extracts from this document...


Physics Course workParis Wells


What is resistance

Resistanceis a substance of resisting the flow of an electrical current. The quantity of resistance in an electric circuit. It controls the amount of current flowing in the circuit. The unit of resistance is the ohm. The standard abbreviation for electric resistance is R . The electrical calculation which is used to find out resistance
The resistance of an object is determined by the length and the circular area of the object (width ), and by the temperature and material. The resistance is proportional to the object's length, and inversely proportional to its circular area of the object (width ). A material's resistance increases with increases in temperature.

Ohms Law

        Resistance is measured in Ohms with a symbol.

-Ohm’s Law states

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The different lengths of wire are measured out with fixed diameter and the same metal. The two crocodile clips where attached to the two ends of wires. The wires are connected to the crocodile clicks. Then the wires are connected to the Meter. The reading is read off the meter and written down. This repeats for all the different lengths.


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I would use other materials rather than just nichrome

Further experimental work

I would change the temperature of the experiment and see how this would affect the resistance. I would predict that it would raise the resistance as the atoms are vibrating faster so the electrons will not get through very easily. This is the equipment  I would set up to show this theory:


I could also change the way in which I measured the resistance. I could use a voltmeter and an ammeter. I would put the voltmeter in parallel with the piece of wire and I would put the ammeter in series with the rest of the circuit.



        My predictions where right as the resistance was nearly be directly proportional to the length of the wire. So the longer the wire will be the higher the resistance will be.

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