23 Series And Parallel Circuits - Vernier Software & Technology

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Computer 23Part III: CurrentsR 1(Ω)R 2(Ω)I 1(A)I 2(A)1 10 512 51 68ANALYSIS1. Examine the results of Part I. What is the relationship between the three voltage readings: V 1 ,V 2 , and V TOT ?2. Using the measurements you have made above and your knowledge of Ohm’s law, calculatethe equivalent resistance (R eq ) of the circuit for each of the three series circuits you tested.3. Study the equivalent resistance readings for the series circuits. Can you come up with a rulefor the equivalent resistance (R eq ) of a series circuit with two resistors?4. For each of the three series circuits, compare the experimental results with the resistancecalculated using your rule. In evaluating your results, consider the tolerance of each resistorby using the minimum and maximum values in your calculations.5. Using the measurements you have made above and your knowledge of Ohm’s law, calculatethe equivalent resistance (R eq ) of the circuit for each of the three parallel circuits you tested.6. Study the equivalent resistance readings for the parallel circuits. Devise a rule for theequivalent resistance of a parallel circuit of two resistors.7. Examine the results of Part II. What do you notice about the relationship between the threevoltage readings V 1 , V 2 , and V TOT in parallel circuits.8. What did you discover about the current flow in a series circuit in Part III?9. What did you discover about the current flow in a parallel circuit in Part III?10. If the two measured currents in your parallel circuit were not the same, which resistor had thelarger current going through it? Why?EXTENSIONS1. Try this experiment using three resistors in series and in parallel.2. Try Part III of this experiment using small lamps instead of resistors. Can you explain thechange in the shape of the current vs. time graphs?23 - 6 Physics with Vernier
Vernier Lab Safety Instructions DisclaimerTHIS IS AN EVALUATION COPY OF THE VERNIER STUDENT LAB.This copy does not include:• Safety information• Essential instructor background information• Directions for preparing solutions• Important tips for successfully doing these labsThe complete Physics with Vernier lab manual includes 35 labs and essential teacherinformation. The full lab book is available for purchase at:http://www.vernier.com/cmat/pwv.htmlVernier Software & Technology13979 S.W. Millikan Way • Beaverton, OR 97005-2886Toll Free (888) 837-6437 • (503) 277-2299 • FAX (503) 277-2440info@vernier.com • www.vernier.com
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