FinishedPhysic-Lab8-Ohms&KirchhoffsLaws

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Glendale Community College *

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MISC

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Electrical Engineering

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Feb 20, 2024

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12 8. OHM’S AND KIRCHHOFF’S LAWS Answer the questions based on data from the lab. 1) State Kirchhoff’s current law. ___________________________________________________________________________ _________________________________________________________________________ 2) For the parallel circuit, record the experimental data in the following table, including the current meter at the bottom of the power supply. I t I 1 I 2 I 1 + I 2 Top Bottom 3) Is the sum of I 1 and I 2 shown on the top meters exactly equal to I t ? If not, why not? ___________________________________________________________________________ ___________________________________________________________________________ 4) Which of the four meters has the greatest precision? Which has the least accuracy? Recall the lab on Laboratory instruments concerning accuracy and precision. ________________________________________________ 5) State Kirchhoff’s voltage law. ___________________________________________________________________________ _________________________________________________________________________ 6) Record the source voltage and the voltage drops across the series resistors. Also record the current through the circuit. V s V 1 V 2 I Does V 1 + V 2 = V s ? _______________ 7) State Ohm’s Law. Rearrange the equations to solve for I, V, and R. ___________________________________________________________________________ ___________________________________________________________________________ 8) In this series circuit, how do we know the current in R 1 equals the current in R 2 ?
13 _________________________________________________________________________ 9) Using Ohm’s Law and the data recorded in Question #6, calculate the resistance of R 1 and R 2 in the series circuit. The symbol used for ohms is the Greek omega, Ω. _________________________ 10) Were the calculated resistances approximately the same as that printed on the resistors? _________________ 11) Record the source voltage ______ and the source current _______ of the resistors connected in parallel. 12) Calculate the current through the 50 Ω and the 101 Ω resistors. Then, add the two currents. Do they total the source current? ____________________________ 13) Using the source voltage and current, calculate the total circuit resistance. __________________ 14) Calculate the parallel resistance of the 50 Ω and 100 Ω resistors using the parallel resistance formula. Is the parallel resistance the same when calculated using R=I/V? _______________________
14 15) Record the voltages and currents applied to the incandescent light bulb. Voltage Current Resistance 16) Research – Why did the resistance of the tungsten filament change? ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________
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