E11_2-23-10

# 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?
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