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Practical: Resistivity (Analysis (Explain why you need to use a wire to…
Practical: Resistivity
Analysis
Explain how you might change the apparatus to calculate your value for the resistivity with greater resolution
Instead of a multimeter (which reads to two significant figures), use a voltmeter and an ammeter (which both read to three significant figures)
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Explain why you need to use a wire to find the resistivity of a metal and explain what shape of sample would be suitable for a plastic
A metal has low resistivity and a wire has a small cross-sectional area and a great length so the resistance is becomes measureable
A plastic has high resistivity so a high cross-sectional area and small length would give a measureable resistance
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Method
Attach one lead to a fixed end of the wire and the other lead with the crocodile clip to the wire approximately 10cm from the fixed end. The leads should be connected to the multimeter
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Calculation
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The graph will not go through the origin because there is some resistance in the leads and between the leads and the wire
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