9-22-11 Basic DC Circuits II

Mathematically if the resistors were scaled by that

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the current going through them? Mathematically, if the resistors were scaled by that constant, the equations would become: This means that the current flowing through each resistor would be reduced by III. Kirchhoff’s Voltage Law In this portion, we were given a circuit (Figure 3) and asked to use Kirchhoff’s Voltage Law to evaluate it. Once again, the format for this section will follow I and II. Figure 3. The circuit for part III, note that it is completely in series, meaning voltage will drop across each component. Evaluating the Circuit with Kirchhoff’s Voltage Law: 1. 2. 3. 4. 5. Using Ohm’s Law to Find the Voltage Drop across Each Resistor: 1. 2. 3. 4. 5. With these values for the theoretical current and voltage drop across each resistor, we were able to build the circuit and measure the actual current and voltages. Again, we had to match the resistors specified in Figure 3, and this time we were able to get the values stated. Table 3. The currents and voltages measured across each resistor Resistor Theoretical Current () Measured Current () Percent Difference Theoretical Voltage () Measured Voltage () Percent Difference 0.037 0.04 8.1% 0.074 0.088 19% 0.037 0.04 8.1% 0.37 0.437 18% 0.037 0.04 8.1% 0.74 0.890 20% 0.037 0.04 8.1% 3.7 4.47 21%
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Question 1. Can two independent voltage sources be placed in parallel? Why or why not? In theory, placing two independent voltage sources in parallel is possible, but unnecessary. In practice, however, placing independent voltage sources (such as batteries) in parallel adds their current output, which can be useful in large current draw and extended life operations. Question 2. Can two independent current sources be placed in series? Why or why not? Again, in theory this practice would be useless. Yet once again, in practice, this idea has merit. Much like the current adding in Q1, if one were to put current sources in parallel, their voltage outputs would be added together.
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