# act04ans - Do NOT write on these sheets or take them with...

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Do NOT write on these sheets or take them with you! The next class needs them too! PHYS-1200 PHYSICS II SPRING 2005 Class 4 Activity: Current and Resistance RESULTS This experiment has two parts. In part I you will investigate the electrical properties of a light bulb and a commercial resistor. In part II, you will examine the temperature dependence of resistance. Part I. Ohmic vs. Non-Ohmic Resistors Equipment: ---- DC Power supply & volt meter (source of the emf) ---- Multimeter used as an ammeter ---- four different resistors ---- three banana connector cables ---- Liquid Nitrogen and Styrofoam cup 1) Connect the circuit using the light bulb as the resistor as shown below. E is a source of emf, the DC Power supply; it provides a potential difference, or voltage, to the circuit. A voltmeter is already built into the power source to measure the potential difference at its output. A is the multimeter, set to operate as an ammeter, and wired in series so all the current flows through it. R is the light bulb. 2) Adjust the power supply so that the current in the light bulb, i , varies from 0 to about 0.15 A (or something close to the maximum that you can get) in ten (10) steps. Record the current,

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## This note was uploaded on 09/17/2008 for the course PHYS 1200 taught by Professor Stoler during the Spring '06 term at Rensselaer Polytechnic Institute.

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act04ans - Do NOT write on these sheets or take them with...

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