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GCSE Coursework Science Resistance in a Wire Chantal du Thoit Candidate number: 0002 15/02/2006 Table of Contents 1) Introduction 2 Factors that affect the electrical resistance of a length of wire 3 Apparatus that I'm going to use. 4 Preliminary work 5 2) Hypothesis 6 3) Method 7 4) Results 8 5) Evaluation 10 6) Conclusion 10 1) Introduction An electric current flows when charged particles (called electrons) move through a conductor. As the electrons move through the conductor they collide with the conductor's atoms. This makes it more difficult for the current to flow which is what we know as resistance. George Ohm discovered that the emf (electromotive force) of a circuit is directly proportional to the current flowing through the circuit. This means that if you triple one (i.e. the current or voltage) you also triple the other. He also discovered that a circuit sometimes resisted the flow of electricity. He called this resistance. He then came up with a rule for working out the resistance of a circuit: V/I = R or V - Volts I - Current R - Resistance Factors that affect the...

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