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PHYSICS LAB-3Ohm’s LawAna AguilarMembers: Ana Aguilar, John CoreyTA: Yiqin XuFRIDAY: 2:00-3:50 PMDATE OF LAB: SEPTEMBER 19, 2014Abstract:Ohm’s Law states that the voltage drop over a resistance isproportional to the current. Where voltage drop is V in volts, resistance is R inohms and current is I in amperes. We studied this experiment in three differentparts. A single resistor, a light bulb and a piece of graphite were used to do thisexperiment. In the last part of this experiment a voltage is applied to thesection of graphite and its resistivity is calculated using tabulated data. Wefound that the resistivity of the graphite was 3.95 *10^-4 ± 6.147*10^-5 Ω.
Objective:To study and understand the relationship between voltage, resistance andcurrent using Ohm’s Law which states that V=IR. In the first part we examine aresistor and we graph I vs. V studying the relationship between these two. Inthe second part, we do the same thing with a light bulb. In the third part, wemeasured the current in five different lengths and we use this to calculate theresistivity (ρ) of the piece of graphite.