# Physics 2204 Lab Report 4 - Physics 2240 Experiment 4 Ohm's...

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Physics 22402/25/2016Experiment 4Ohm's Law and Series Parallel CircuitsStephen Rocha
IntroductionWe will be verifying Ohm's Law for commercially manufactured resistors and validating to makesure they behave the way they should. We are going to examine resistors, a diode, and a lightbulb. To verify our law in whole circuits, we need to have a way to measure the total resistanceof an entire circuit. We can do so by using the total current, and voltage. We will start bymeasuring the voltage and current, and using those values to determine an experimentalresistance. TheoryTheoretically, Ohm's law states that V=IR. This means that the voltage across any component isequal to the current multiplied by the resistance. Resistance for an entire circuit in series can besolved by using Req=R1+R2. Resistance for circuits in parallel can be derived using1/Req=(1/R1)+(1/R2) or Req=(R1R2)/(R1+R2).Ω: Ohm, unit for resistanceRn: Certain labeled resistor in circuitReq: Equivalent resistance for a circuitV: VoltageI: CurrentR: Resistance
Experimental ProcedureOnce the experiment was set up with our 330Ω resistor, we clicked record. After clicking record,we collected about 10 seconds worth of data. We then relabeled our data to make it easier to identify later in the experiment. We then replaced our 330Ω resistor with a 560Ω resistor then recorded and labeled that run as well. After both of our resistors, we connected a light bulb in place of a resistor and recorded that data for around 30 seconds rather than the previous 10 on our resistor runs. Looking at the graph, we should notice a kink in our data, and should note what is happening to our light bulb as it approaches the kink. For our diode, we disconnected the white jumper cables and placed a diode instead, arranging so that the gray end is "up". We then reduced the voltage to 10V and collected about 10 seconds worth of data and labeled the run accordingly. After, we reversed the diode so the grayend was down and repeated the process labeling the run accordingly.