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Pirkt
Identifikators:485186
Autors:
Vērtējums:
Publicēts: 19.09.2003.
Valoda: Angļu
Līmenis: Vidusskolas
Literatūras saraksts: Nav
Atsauces: Nav
Darba fragmentsAizvērt

Conclusion: Looking at the graph I can see as the length of the wire increased so did the resistance and it is at a constant rate. This relates to the theory where as the wire gets longer, the atoms are vibrating making it harder for the electrons to flow causing more resistance. This agrees with my prediction as I did believe that the longer the length the more resistance there would be.
Evaluation
I think my method was fair because throughout the experiment, the width of the wire was the same at swg. The voltage inputs for each length were kept the same at 3, 4, 5, 6 and 7 volts. The material we used was an alloy which is a mixture of metals. All the equipment I used was not altered. The power pack, volt meter, ammeter, wire etc were kept the same.
My results were quite accurate. The graph where I have plotted resistance against length shows this. I can put a straight line through my graph showing that the increase rate was constant. Looking at my graph, at about 80cm, the resistance is a bout 2.75ohms. The results show that as the length of wire increased so did the resistance.
I had one anomalous result which was where the current was 0.30 and the voltage was at 0.63 which gave me a resistance of 2.1ohms which is an outlier in the 80cm length readings.

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