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How does the length and cross-sectional area of a wire affect resistance
Member rating: No Rating | Words: | Submitted: Fri Mar 31 2006
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How does the length and cross-sectional area of a wire affect resistance? Introduction: This investigation sets out to prove that resistance is affected if the length and cross sectional area of a wire is varied. Theory: Resistance occurs when the electrons travelling along the wire collide with the atoms of the wire. These collisions slow down the flow of electrons causing resistance. Resistance is a measure of how hard it is to move the electrons through the wire. To calculate the resistance in a circuit this formula (Ohms Law ?) can be used. Resistance (ohms ?) = Potential Difference (V) Current (A) Prediction: I predict that if the length of the wire increases then the resistance will also increase in proportion to the length. If the length is doubled the resistance should also double. This is because if the length is doubled the number of atoms will also double resulting in...
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