Thus r p r 1 r 2 r 1 r 2 electrical power is given by

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Introduction to Statistics and Data Analysis
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Chapter 1 / Exercise 5
Introduction to Statistics and Data Analysis
Olsen/Peck
Expert Verified
thusRp = R1R2/R1+R2Electrical power is given by P = IV = I2R (because remember: V = IR)Method:First, use voltmeter and ammeter to measure dc voltage and current. Begin by using the DMM to measure resistances of 4 resistors and record the values in table 1. Now connect the circuit as seen in figure 1 on pg. 23. With DMM2 set to 5V, measure the voltages V1, V2, V3, V4across R1,R2, R3, R4. Use DMM1 to measure the current. Record your values in table 2. Next connect the circuit as seen in figure 2(a) on pg. 24 (in series). Turn the power supply on to 5V. Observe the brightness of the bulbs, which act as resistors and record the value of the current in table 3. Repeat this same step for the remaining figures on pg. 24. The third measurement involves resistors in a parallel connection. Begin by connecting the circuit as shown in figure 3(a) on pg. 25. Turn the power supply on to 5V and observe the brightness of the bulbs and record the value of the current in table 4. Repeat the same step for the remaining figures on pg. 25. Lastly, measure the current of resistors in both a series and parallel fashion. Connect the circuit like that seen in figure 4 on pg. 26. Turn on the power supply to 5V and observe the current and brightness of the resistors. Record the results in table 5. Now change the power supply to 10V. Repeat the previous step but this time, remove a light bulb (resistor) each time and record the results in table 5.
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Introduction to Statistics and Data Analysis
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Chapter 1 / Exercise 5
Introduction to Statistics and Data Analysis
Olsen/Peck
Expert Verified
Data:Table 1 Measured ResistancesR1R2R3R4103.5555.33102.82190.71Table 2 Measured and Calculated Voltages and CurrentsMeasured dataCalculated dataSource Voltage Vs5V5VV1(V)1.5021.55V2(V).5660.55V3(V).5660.55V4(V)2.872.85Is(mA)15.2314.89I1(mA)15.2314.89I2(mA)Not measured14.89I3(mA)Not measured14.89I4(mA)15.2314.89Table 3 Measured currents and observed bulbs’ brightness for the circuits in Fig. 2Source VoltageCasesMeasured Current(mA)Observed bulbs’ brightnessBrightLess brightDimVery dimNo lightVs= 5VFig. 2 (a).2240XFig. 2 (b).1530XFig. 2 (c).1180XFig. 2 (d).1000XFig. 2 (d) but with onelight bulb removed0XTable 4 Measured currents and observed bulbs’ brightness for the circuits in Fig. 3Source VoltageCasesMeasured Current(mA)Observed bulbs’ brightnessBrightLess brightDimVery dimNo lightVs= 5VFig. 3 (a)222XFig. 3 (b)444XFig. 3 (c)649XFig. 3 (d)848XFig. 3(d) but with one light bulb removed647X
Table 5 Measured currents and observed bulbs’ brightness for the circuits in Fig. 4

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