9-22-11 Basic DC Circuits II

# Iv equivalent resistance in this procedure we

• Notes
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IV. Equivalent Resistance In this procedure, we calculated the equivalent resistance of a circuit given in the lab manual (Figure 4). After that, we built the circuit and confirmed our calculations. For the final time, the same format will be used. Figure 4. The circuit we were asked to simplify. Evaluating the Circuit with Kirchhoff’s Voltage Law: 1. 2. 3. 4. By finding the equivalent resistance of the circuit, we were able to calculate the theoretical current running through the circuit. We then measured the current and compared the two. Then we built a circuit using only one resistor, as close to the equivalent resistance as we could find. Table 4. The current measured through the circuit Theoretical Current () Measured Current with Full Circuit () Percent Difference Measured Current with One Resistor () Percent Difference 2.88 2.94 2.1% 2.98 3.5% Conclusion All things considered, this experiment verified the laws we were asked to verify rather well. We were able to predict the right values for current and voltage division, and we managed to build a circuit with equivalent resistance to one that was more complex. However, it is of note, there was large error in section III, Kirchhoff’s Voltage Law. This could have been due to a wiring mishap, wherein the complexity of the circuit made putting it together more difficult. One can also see, all of the percentages of error were precise in about 20%. This means that the

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equipment was not faulty, the experiment was performed consistently, yet something still was not quite right. For every other section, though, error was thankfully standard, under 3%.
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• Fall '11
• Parallel Circuit, Volt, Resistor, Electrical resistance, Electrical impedance, Series and parallel circuits, 1.2%

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