# Exp 2.docx - Florida Atlantic University Physics II Lab Lab...

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Florida Atlantic UniversityPhysics II LabLab Report: Experiment IIResistors in series and parallel connections (1)Lab Date: 1/26/18Date submitted: 2/2/18PHY2049L:Section- 023Student: Lab Instructor: Zichang Huang
Purpose:Lab students were instructed to investigate the relationship of voltage (V), current (I) and resistance or Ohms (R) by measuring these values in various series. Examiners applied Ohm’s theory of voltage or potential difference applied across a conductor resulting in a current being proportional to voltage resulting in resistance within the circuit to be quantified (eq1). Characteristic of resistors applied to both series and parallel circuitry were observed using a digital millimeter.Theory:Ohm’s Law is that the amount of electric current through a metal conductor in a circuit is directlyproportional to the voltage impressed across it, for any given temperature. This principal can be calculated in the equation, describing how voltage, current, and resistance interrelate:eq1) R=VIResistors can be arranged in seires or parallel. In series circuits, the resistors are attached in a head-to-tail” fasion. The current remains constant, but the sum of voltage drops (eq2)(eq3)eq2)V=V1+V2=I R1+I R2=I(R1+R2)=I Rseq3)Rs=R1+R2Rsrepresents the equivlent resistance of R1and R2When connected in parallel circuits, the resistors are attached “head-head” & ”tail-tail”. Where the voltage drops acros all the resistors remaining constant. The current from the source essentially is divided among the resistors (eq4).I=I1+I2=VR1+VR2=VRp1Rp=1R1+1R2eq4)Rp=R1R2R1+R2Rpis the equivalent resistance of R1and R2in parallel connection.The change in electric energy per unit time is called electric power. The power dissipated by the resistor is given in (eq5)eq5)P=IV=I2R
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