Lab_9 - Physics 272Lab Lab 9: Energy Conservation in...

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Physics 272Lab Lab 9: Energy Conservation in Circuits & Charge on a Capacitor Lab 9: Energy Conservation in Circuits & Charge on a Capacitor Part (1) Energy Conservation in Circuits OBJECTIVES In this part of the lab you will Write the energy conservation equation (loop rule) for several pairs of circuits Predict the relation between the currents in each circuit pair Learn the proper use of an ammeter (a multimeter in current mode) Check your predictions of the current relations 1) Warm-up Problem: Problem (1) The electron current is i = nA v = nAuE What are the units of electron current? What is n? What are its units? What is A? What are its units? What is v ? What are its units? What is u? What are its units? CHECKPOINT 1: Ask an instructor to check your work for credit. You may proceed while you wait to be checked off 2) Current Predictions a) Get out the following items for this part of the lab 2 batteries with battery holder 3 alligator clips 1 multimeter 1 piece of thick nichrome wire 1 piece of thin nichrome wire, equal in length to the thick. You may need to role the wires in your fingers to feel the difference between thick and thin. b) Put away everything else (except your lab manual), so your table is neat and clear. The potential difference around any closed path must be zero. If you make the path to be the path current takes through a circuit, this simple fact becomes a powerful tool for analyzing circuits. You will analyze three pairs of circuits. In each pair, the two circuits will only differ in one way. You must analyze the circuit and determine how this difference affects the current in each circuit.
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Physics 272Lab Lab 9: Energy Conservation in Circuits & Charge on a Capacitor The first pair of circuits: c) Write the energy conservation equation for each circuit. Do this entirely in symbols i.e. the voltage difference across the battery should be ΔV bat not 1.5 V.
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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 University-West Lafayette.

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Lab_9 - Physics 272Lab Lab 9: Energy Conservation in...

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