UMass Amherst PHYSICS 132  Physics Lab 5 132 (4 pages)
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Physics Lab 5 132
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 4
 School:
 University of Massachusetts Amherst
 Course:
 Physics 132  Intro Physics II
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Ohm s Law Physics 132 ILC S110 8 10 17 Abstract This lab allowed us to experiment with circuits resistors and the application of Ohm s Law We tested how resistors differed in a parallel vs series circuit and found the values of the resistors both through our own mathematical and experimental abilities by finding the values of voltage and currents and the actual value using an Ohmmeter Ohm s law states that the current through a conductor between two points is directly proportional to the voltage across the two points so for our experiment to prove Ohm s law our graph of our data of Voltage vs current should be proportionally and stably increasing in a straight line Questions Answers 1 Think about a string of holiday lights When one bulb burns out the other bulbs continue to shine What does that mean for the nature of wiring in the string 2 points The nature of the wiring of the string is parallel because when one light burns out it does not affect the other ones This means each bulb has it s own circuit 2 Consider two resistors of equal resistance You can combine them in a circuit either in series or in parallel Which combination would have the higher effective resistance series or parallel Which would carry more current series or parallel 2 points The higher effective resistances would occur in a series circuit a parallel circuit would carry a more effective current since it has higher power 3 State the equation for Ohm s law What do the variables V I and R stand for and what are the units of each Of the units listed which one is equivalent to coulomb second 1 point The equation for Ohm s law is R V I V stands for voltage R stands for resistance and I stands for the current that flows through the resistor The units for V are Joules per Coulomb J C the units for R is Volts Amps and the units for I is C s or Amps Of the units listed I is equivalent to coulomb second 4 From part 5 1 2 Ohm s law Produce a graph of voltage V as a function of current I Compute the slope
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