# UMass Amherst PHYSICS 132 - Phys 132 Ohm's Law Lab 2 Report (5 pages)

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## Phys 132 Ohm's Law Lab 2 Report

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- Pages:
- 5
- School:
- University of Massachusetts Amherst
- Course:
- Physics 132 - Intro Physics II

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DC Circuits and Ohm s Law Physics 132 Abstract This experiment was to prove Ohm s laws through mathematical calculations as well as a physical experiment on light bulbs and other resistors We used the equation for Ohm s law which uses voltage and current to determine resistance either through an actual resistor or a light bulb We measured the input and output of the generator and the difference between the two Overall our experiment was very successful Questions and Answers 1 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 a V I R b V electric potential or potential difference measured in volts c I current measured in amps which are coulombs second d R resistance measured in ohms 2 From Part 3 1 1 Power Supply Produce a graph of output voltage Vout as a function of the sliding contact position x measured from the bottom end of the slide wire resistor Verify that the data points fall on a straight line rather than a curve don t actually compute the slope Did the current change while you varied the sliding contact position x Hint Your current meter was switched off during this part but this question can be answered using Ohm s law and your graph a As you can see from the trendline on this graph the data does fall relatively linearly with minimal discrepancy The charge did differ from one side of the slider to the other You can see that it rises dramatically the farther the position is from zero 3 From part 3 1 2 Ohm s law Produce a graph of voltage V as a function of current I Compute the slope which will give the resistance R in ohms of the resistor In the lab you should also have deduced R from the color coding on the side of the resistor itself recall in lab question 1 Does your value for R fall within the manufacturer s expectations a The closes slope would be 0 039 as shown by the trendline on the graph below The R value of the first resistor is 36 7 and the R value for the second is 11 2 4 From part 3 1 5 resistors in series parallel Using the resistor color code in your manual part 3 2 write the value of each resistor used in this part of the experiment From this compute the total resistance Rtot i resistors in series and ii resistors in parallel You will need to use the following two equations for computing total resistance R series R 1 R 2 1 Rparallel 1 R1 1 R2 a R1 color code 3 10 6 10 0 R1 ohmmeter 36 7 5 R1 and R2 in Series R2 color code 1 10 0 10 0 R2 ohmmeter 11 2 10 R1 and

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