PROCEDURE: 1. Measure and record the actual values of the four resistors listed in Table 101.


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2 The answer to two questions will help you identify a series or parallel connection: (1) Will the identical current go through both components? f the answer is yes, the components are in series. (2) Are both ends of one component connected directly to both ends of another component? f yes, the components are in parallel. The components that are in series or parallel may be replaced with an equivalent component. This process continues until the circuit is reduced to a simple series or parallel circuit. After solving the equivalent circuit, the process is reversed in order to apply the solution to the original circuit. This idea will be studied in this experiment. PROCEDURE: 1. Measure and record the actual values of the four resistors listed in Table Connect the circuit shown in Figure Notice that the identical current is through R, and R4, so we know that they are in series. R2 has both ends connected directly to R3, SO these resistors are in parallel. Figure You can begin solving for the currents and voltages in the circuit by replacing resistors that are either in series or in parallel with an equivalent resistor. n this case, begin by replacing R2 and R3 with one equivalent resistor. Label the equivalent resistor R2,3. Draw the equivalent series circuit in the space provided in the report. Show the value of all components, including R The equivalent circuit you drew in step 3 is a series circuit. Compute the total resistance of this equivalent circuit and enter it in the first two columns of Table Then disconnect the power supply and measure the total resistance to confirm your calculation. Enter the measured total resistance, RT, in column The voltage divider rule can be applied directly to the equivalent series circuit to find the voltages across R,, R2,3, and R4. Find V,, V2.3, and V4 using the voltage divider rule. Tabulate the results in Table 102 in the Voltage Divider column. 6. Find the total current, T, in the circuit by substituting the total voltage and the total resistance into Ohm's law. Enter the computed total current in Table 102 in the Ohm's law column.
3 7. n the equivalent series circuit, the total current is through R1, R2,3, and R4. The voltage drop across each of these resistors can be found by applying Ohm's law to each resistor. Compute V,, V2,3, and V4 using this method. Enter the voltages in Table 102 in the Ohm's law column. 8. Use V2.3 and Ohm's law to compute the current in R2 and Rj of the original circuit. Enter the computed current in Table As a check, verify that the computed sum of 2 and 3 is equal to the computed total current. 9. Measure the voltages V,, V2,3, V4, and Vs. Enter the measured values in Table Change the circuit to the circuit shown in Figure n the space provided in your report, draw an equivalent circuit by combining the resistors that are in series. Enter the values of the equivalent resistors on your schematic drawing and in Table Figure Compute the total resistance, RT, of the equivalent circuit. Then apply Ohm's law to find the total current T. Enter the computed resistance and current in Table Complete the calculations of the circuit by solving for the remaining currents and voltages listed in Table Then measure the voltages across each resistor to confirm your computation. FOR FURTHER NVESTGATON: Figure 104 illustrates another seriesparallel circuit using the same resistors. Develop a procedure for solving the currents and voltages throughout the circuit. Summarize your procedure in a laboratory report. Confirm your method by computing and measuring the voltages in the circuit. Q Figure 104
4 APPLCATON PROBLEM: For many years, resistive networks have been designed to control the signal level of audio or radio frequency circuits and to match the resistance of the source and load. Circuits that perform these functions are called attenuators, or pads. There are a number of variations in pad design, but in this problem we will design an Lpad used in matching a higher resistance to a lower resistance. The circuit is shown in Figure The first dotted box represents a signal source with a source resistance of 600 a. (The source resistance is internal on ac signal generators.) The Lpad consists of the two resistors shown in the second dotted box, and the load is in the third dotted box and represents the circuit being driven by the source.,"y~yqn= Source L  pad Load i 1, 1, 0 R2 100 load R L J L Figure 105 The resistors in the Lpad depend on the source resistance, the load resistance, and the desired attenuation of the pad. n this design, the attenuation must be greater than the ratio of the source to load resistance. The equations for determining these resistors are where: Rs = source resistance RL= load resistance A = attenuation; the ratio of inputloutput voltage The design requires an Lpad that matches a 6000 source resistance to a 100 load resistance with a 10: 1 attenuation from the input of the Lpad. Compute the values of the resistors in the Lpad and construct the circuit based on your design using resistors as close as possible to the calculated values. The source can be a signal generator with an internal 600 i2 resistance set for a 1 khz sine wave or a dc power supply with a series 600 i2 resistor. Set the source voltage to 5.0 V when it is connected to the rest of the circuit. f you have correctly calculated the values of the resistors in the Lpad, the output voltage measured across the load resistor should be 0.5 V and the resistance of the circuit measured looking into the Lpad should be 600 a. Summarize your results in your report.
5 Listed Measured Component Value Value R 2.2 kn R2 4.7 kn R3 R4 5.6 kfl 10.0 kn
6 EVALUATON AND REVEW QUESTONS: 1. The voltage divider rule was developed for a series circuit, yet it was applied to the circuit in Figure (a) Explain. (b) Could the voltage divider rule be applied to the circuit in Figure 103? Explain your answer. 2. As a check on your solution of the circuit in Figure 103, apply Kirchhoff's voltage law to each of two separate paths around the circuit. Show the application of the law. 3. Show the application of Kirchhoff's current law to the junction of R2 and R4 of the circuit in Figure n the circuit of Figure 103, assume you found that T was the same as the current in Rj and R4. (a) What are the possible problems? (b) How would you isolate the specific problem? 5. The circuit in Figure 106 has three equal resistors. (a) f the voltmeter reads +8.0 V, find the voltage drop across R1. V1 = (b) What is the source voltage? Vs = Figure What basic rules determine if two resistors in a seriesparallel combination circuit are connected in series or in parallel?
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