ETEC_110 -

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New York Institute of Technology, Westbury *

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110

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Electrical Engineering

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Jan 9, 2024

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ETEC 110 – DC Circuits Lab

Objective 1)Measure and have a clear understanding how the resistor color code works 2)clearly identify the nominal values of each resistor with its maximum and minimum value 3)evaluate how evaluating the resister incorrectly effects the resister nominal value by calculating the percent error 4)clearly measure voltages using the digital multimeter Theory The connection between voltage and current via various resistors, as well as be able to determine the ohm resistances of each resistor using their color bands Part 1 Calculations Resister color code and resistance measurements res 1 st Band 2 nd Band 3 rd Band 4 th Band Nominal Tolerance Min. Max. 1 Blue Grey Black Gold 68 Ω +/- 5% 64.6 Ω 71.4 Ω 2 Yellow Purple Brown Gold 470 Ω +/- 5% 446.5 Ω 493.5 Ω 3 Brown Black Red Gold 1k Ω +/- 5% 950 Ω 1.05k Ω 4 Orange White Orange Gold 39k Ω +/- 5% 37.05kΩ 40.95k Ω 5 Red Red Yellow Gold 220k Ω +/- 5% 20.9k Ω 23.1k Ω Equation Minimum resistance = Nominal - (Nominal x Tolerance) Maximum resistance = Nominal + (Nominal x Tolerance)

Percentage difference calculations res Nominal Value Measure Value Percentage Difference Specified Tolerance Falls within specified tolerance? 1 68 Ω 68.7k Ω 1.0% +/- 5% YES 2 470 Ω .463k Ω 1.5% +/- 5% YES 3 1k Ω .978k Ω 2.2% +/- 5% YES 4 39k Ω 38.2k Ω 2% +/- 5% YES 5 220k Ω 217.8k Ω 1% +/- 5% YES Equation Percentage difference = | Nominal –measure | ------------------------- x100% | Nominal | Measuring resistance -By using the digital multimeter, we obtain the measure values for the resisters, and we compare them by the nominal value and measure value to see how accurate they are. Procedure calculating the percentage difference wrong After measuring the resistors correctly, we were going to measure the resistors incorrectly and compare the data between both, we were calculating the percentage error by holding both ends of the resistors and showing how it can affect the calculations. Res Nominal value Measure value wrong Percentage difference error Specific tolerance Does it still fall in specified tolerance 1 68 Ω 68.7k Ω 1.0% +/- 5% YES 2 470 Ω .462k Ω 1.7% +/- 5% YES 3 1k Ω .975k Ω 2.5% +/- 5% YES 4 39k Ω 37.2k Ω 4.6% +/- 5% YES 5 220k Ω 179.5k Ω 18.4% +/- 5% NO

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What resistor does not fall into the specific tolerance after calculating the percentage different error? The only resister that does not fall in the specified tolerance is resistor 5 with a nominal value of 220kk Ω which has a percentage difference error by 18.4% which is 17.4% higher than the original. Why does this occur? The higher the nominal value of the resister the more off is going to be after doing the measure value wrong and the lower the nominal value they will beardly be any changes and it will beardly affect it. Part 2 Measuring D.C Voltages using the digital multimeter Power supply voltage setting Measured Voltage (DMM) Percentage Difference 0.1 0.239V 139% 0.5 0.602V 20.4% 1.8 1.956V 8.6% 6.7 6.89V 2.8% 15.4 15.70V 1.9% Witch meter is more accurate, the power supply built-in-meter, or the DMM? The DMM is more accurate because it is a meter precision device, and the power supply is not there for the DMM can accurately calculate the voltage. Conclusion In conclusion, by using the resistor color code, minimum and maximum resistance, we determine the resistance of each resistor we got and put them from least to greatest depending on their measurement. We calculated the percentage difference and difference error by completing one doing it correctly by only holding one end and the wrong way by holding both ends of the DMM. We calculate the voltages by using the digital multi meter and accurately measure the percentage difference between power supply voltage settings and measure voltage with the DMM.