E11_2-23-10 - E11: More with Resistance and Resistors...

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E11: More with Resistance and Resistors Materials: Power supply, multimeter, resistors, pencil, paper, play doh, wires, switch Initial definitions and givens: Multimeter: an electrical instrument that can measure voltage, current, and resistance. When a multimeter is used as an ohmmeter to measure resistance, it is not used as part of a circuit or to measure the resistance of a battery or power supply. Initial Instructions and questions: 1. Using the multimeter, measure the resistance of the three resistors you dealt with in E10. Compare the meter measurements with the slopes of your I vs . V graphs. (Remember: 1 ohm = 1 volt/1 ampere. Most of you plotted current in milliamps vs . voltage in volts. You must convert to amperes and realize the slope is 1/R, not R.) 2. Read the color code for all four of your resistors. Compare the manufacturer’s resistance value (from the color code) with your measurements. Are the resistors within tolerance? 3. Use your multimeter to measure the resistance of various objects: yourself, a
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This document was uploaded on 12/27/2011.

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