Lab_10 - Physics 272Lab Lab 10: Macroscopic View of RC...

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Physics 272Lab Lab 10: Macroscopic View of RC Circuits Lab 10: Macroscopic View of RC Circuits OBJECTIVES In this lab you will Use a voltmeter and ammeter to analyze a circuit Determine if components of the circuit are ohmic or nonohmic Calculate the internal resistance of a battery Measure the properties of a capacitor Built on the foundation of a microscopic understanding of circuits, the macroscopic methods of analyzing circuits are useful for designing, understanding, or improving circuits at almost all levels of electronics. In this lab you will use the tools (ammeter and voltmeters), and theories of circuits to analyze the performance of several circuits and circuits components. 1) Warm-Up Problem Problem (1) What are the readings on the three meters in the circuit below? 2) Energy in Circuits a) Get out the following items for this part of the lab 1 20 ohm resistor 1 10 ohm resistor 1 short bulb and holder 2 batteries and holder 6 alligator clips 1 multimeter PASPort voltage probe (see below) Set up a digital multimeter to be an ammeter, i.e. b) Connect the black wire to COM. 10 ohms 20 ohms Two 1.5 V Batteries Ammeter 1 Ammeter 2 Voltmeter
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Physics 272Lab Lab 10: Macroscopic View of RC Circuits c) Connect the red wire to the leftmost connector, labeled 10A. d) Set the dial to 10A. DON’T USE ANY OTHER SETTINGS AT THIS TIME (YOU COULD BLOW A FUSE IN THE METER). Next, you will setup your PASPort voltage probe (pictured below) to be a voltmeter. On the lab software page (http://web.ics.purdue.edu/~jyeazell/Phys272Lab.htm) you’ll find the file titled “Voltmeter.ds”. e) Right click and download it to your desktop (using a .ds extension). f) Double click the file on your desktop and it should open. g) Click START and touch the red lead to the + side of a battery and the black lead to the – side of that battery. If it is correctly setup, the digital display on your computer screen should show approximately 1.5 V. h) Set up the circuit from the warm up problem i) Measure the current at the two locations and the voltage difference across both resistors?
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This note was uploaded on 04/23/2011 for the course PHYS 272 taught by Professor K during the Spring '07 term at Purdue.

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Lab_10 - Physics 272Lab Lab 10: Macroscopic View of RC...

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