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This lesson covers the AQA Required Practical for investigating how the length of a wire affects its resistance (AQA 8464, Required Practical Activity 15). This is one of the most frequently examined practicals in the electricity topic.
To investigate the relationship between the length of a wire and its resistance.
As the length of the wire increases, the resistance increases proportionally. A wire that is twice as long should have twice the resistance, because there are twice as many metal ions for the electrons to collide with.
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