Lab 4 resistivity

# 4 if the wire was not scraped it would have not made

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Unformatted text preview: brighter and the temperature increases, that the resistance also increases. Confirming what was said in the theory that as a metal increases its temperature the resistivity increases. Estimated min slope= 0.013 Estimates max slope=0.047 Using Ohms law, the resistance of the hot filament at 6 volts: R= V 6V = = 25Ω I .240 A Assuming the filament is 1800° C, calculate α: € R = R0 [1 + α (T − T0 )] 25 = 43[1 + (22 − 1800)] α ≈ 0.0045 6 Questions 1. 2. € 1 L 2L 2 R2 ρ 2 A R2 ρ 2 A = = L L R R ρ ρ A A 1 1 L → 2 L, A → A L → L, A → 2 A 2 2 3. An ammeter has very low resistance and a voltmeter has very high resistance, if € € you used an ammeter in place of a voltmeter the ammeter would be damaged. 4. If the wire was not scraped it would have not made good contact with...
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## This document was uploaded on 01/31/2014.

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