Chapter 2Resistive Circuits2.1Kirchhoff's Laws (2-3)Determine currentsIto Iand thevoltageVin the circuit of Figure2.1with component values IsRC = 1.8 mA, VsRc = 9.0 V, Ri = 2.2 k2, R2 =3.3k2,and R3=1.0 k2.11R14Vsrc12R24WV1Isrc+13R34MFigure2.1:CircuitforProblem2.1
Chapter 2 Resistive Circuits 2.1 Kirchhoff’s Laws (2-3) Determine currents I1 to I3 and the voltage V1 in the circuit of Figure 2.1 with component values ISRC = 1.8 mA, VSRC = 9.0 V, R1 = 2.2 kΩ, R2 = 3.3 kΩ, and R3 = 1.0 kΩ. Figure 2.1: Circuit for Problem 2.1
14CHAPTER2.RESISTIVECIRCUITSNIMultisimMeasurementsEnter the circuit of Figure 2.1 on the preceding page into NI Multisim andmeasure the currents Ii to Is and the voltage Vi..Place components from the"Virtual Components"palette.Place a Simulate → Instruments→ Measurement Probe for each current.Place a Simulate→ Instruments→Multimeterto measure the voltageV1.Useinteractivesimulation SimulateRunNI Multisim video tutorials:.Findcommonly-usedcircuitcomponentshttp://youtu.be/G6zJ8c0ja9Q? Measure DC current with a measurement probe:http://youtu.be/uz56byigymI·Measure DC voltage with a voltmeter:http://youtu.be/xLyslyikUwsNImyDAQMeasurementsBuild the circuit of Figure 2.1 on the previous page. Use the myDAQ DMM(digital multimeter) to measure the currents Ii to I3 and the voltage Vi.. Implement the voltage source VsRc according to the circuit diagramof Figure B.2 on page 164.. Measure VsRc with the myDAQ DMM voltmeter and adjust the potentiometer to set the voltage as close to9.0 volts as possible..Implement the current source IsRc according to the circuit diagramof Figure B.4 on page 166. Use a 680 resistor for the adjustmentresistor R..Measure IsRc with the myDAQDMM ammeter and confirm that thecurrent is close to 1.8 mA. If you desire more precision, use a 1.0 k2potentiometer for R3 and adjust it accordingly
14 CHAPTER 2. RESISTIVE CIRCUITS NI Multisim Measurements Enter the circuit of Figure 2.1 on the preceding page into NI Multisim and measure the currents I1 to I3 and the voltage V1. • Place components from the “Virtual Components” palette • Place a Simulate → Instruments → Measurement Probe for each current • Place a Simulate → Instruments → Multimeter to measure the voltage V1 • Use interactive simulation Simulate → Run NI Multisim video tutorials: • Find commonly-used circuit components: http://youtu.be/G6ZJ8C0ja9Q • Measure DC current with a measurement probe: http://youtu.be/uZ56byigymI • Measure DC voltage with a voltmeter: http://youtu.be/XLyslyikUws NI myDAQ Measurements Build the circuit of Figure 2.1 on the previous page. Use the myDAQ DMM (digital multimeter) to measure the currents I1 to I3 and the voltage V1. • Implement the voltage source VSRC according to the circuit diagram of Figure B.2 on page 164. • Measure VSRC with the myDAQ DMM voltmeter and adjust the potentiometer to set the voltage as close to 9.0 volts as possible. • Implement the current source ISRC according to the circuit diagram of Figure B.4 on page 166. Use a 680 Ω resistor for the adjustment resistor R. • Measure ISRC with the myDAQ DMM ammeter and confirm that the current is close to 1.8 mA. If you desire more precision, use a 1.0 kΩ potentiometer for R3 and adjust it accordingly
152.1.KIRCHHOFF'S LAWS(2-3)NI myDAQ video tutorials:: DMM voltmeter:http://decibel.ni.com/content/docs/Doc-12937:DMMammeter:http://decibel.ni.com/content/docs/Doc-12939FurtherExplorationwithNImyDAQResistor R3 shares the same current as the current source. Study the effectof this resistor on the rest of the circuit.1. Replace R3 with a 1.0k2 potentiometer.2. Measure current Ii and record the range of currents you observe asyou adjust the potentiometer over its full range.3. Repeat for currents I2 and I3 and voltage V14. Which of the four measured values appears to be independent of thevalue of R3?5. Which of the four measured values appears to depend on the valueof R3?6.Proposeanexplanationforyourobservations
2.1. KIRCHHOFF’S LAWS (2-3) 15 NI myDAQ video tutorials: • DMM voltmeter: http://decibel.ni.com/content/docs/DOC-12937 • DMM ammeter: http://decibel.ni.com/content/docs/DOC-12939 Further Exploration with NI myDAQ Resistor R3 shares the same current as the current source. Study the effect of this resistor on the rest of the circuit. 1. Replace R3 with a 1.0 kΩ potentiometer. 2. Measure current I1 and record the range of currents you observe as you adjust the potentiometer over its full range. 3. Repeat for currents I2 and I3 and voltage V1. 4. Which of the four measured values appears to be independent of the value of R3? 5. Which of the four measured values appears to depend on the value of R3? 6. Propose an explanation for your observations
16CHAPTER2.RESISTIVECIRCUITS2.2EquivalentResistance(2-4)Find the equivalent resistance between the following terminal pairs underthe stated conditions:1.A-B with the other terminalsunconnected,2. A-D with the other terminals unconnected,3. B-C with a wire connecting terminals A and D, and4. A-D with a wire connecting terminals B and C.AR2BQ0RRsYaR40CDFigure2.2:CircuitforProblem2.2Use these component values:.Ri=10k2·R2=33k2·R3=15k2·R4=47k2. Rs = 22 k2
16 CHAPTER 2. RESISTIVE CIRCUITS 2.2 Equivalent Resistance (2-4) Find the equivalent resistance between the following terminal pairs under the stated conditions: 1. A-B with the other terminals unconnected, 2. A-D with the other terminals unconnected, 3. B-C with a wire connecting terminals A and D, and 4. A-D with a wire connecting terminals B and C. Figure 2.2: Circuit for Problem 2.2 Use these component values: • R1 = 10 kΩ • R2 = 33 kΩ • R3 = 15 kΩ • R4 = 47 kΩ • R5 = 22 kΩ
172.2.EQUIVALENTRESISTANCE(2-4)NIMultisimMeasurementsEnter the circuit of Figure 2.2 on the facing page into NI Multisim and usethe multimeter to measure each of the four resistances under the statedconditions.·Place components from the"Virtual Components"palette.Place a Simulate→ Instruments →Multimeter and choose the ohm-meter setting ("" button).. Place a ground symbol and attach it to one of the multimeter termi-nals.NI Multisim video tutorials:. Find commonly-used circuit components:http://youtu.be/G6zJ8c0ja9Q: Measure resistance with an ohmmeter:http://youtu.be/3G5V0HxjkbgNImyDAQMeasurementsBuild the circuit of Figure 2.2 on the preceding page. Use the myDAQDMM (digital multimeter) as an ohmmeter to measure each of the fourresistances under the stated conditions.. Measure and record the resistance of each resistor individually; dothis before you connect the resistors together..Place the resistors to match the resistor orientations shown in Figure 2.2 on the facing page.. The circuit need not connect to the myDAQ analog ground AGNDterminal; only Multisim requires the ground connection.NImyDAQvideotutorials. DMM ohmmeter:http://decibel.ni.com/content/docs/Doc-12938
2.2. EQUIVALENT RESISTANCE (2-4) 17 NI Multisim Measurements Enter the circuit of Figure 2.2 on the facing page into NI Multisim and use the multimeter to measure each of the four resistances under the stated conditions. • Place components from the “Virtual Components” palette. • Place a Simulate → Instruments → Multimeter and choose the ohmmeter setting (“Ω” button). • Place a ground symbol and attach it to one of the multimeter terminals. NI Multisim video tutorials: • Find commonly-used circuit components: http://youtu.be/G6ZJ8C0ja9Q • Measure resistance with an ohmmeter: http://youtu.be/3G5V0Hxjkbg NI myDAQ Measurements Build the circuit of Figure 2.2 on the preceding page. Use the myDAQ DMM (digital multimeter) as an ohmmeter to measure each of the four resistances under the stated conditions. • Measure and record the resistance of each resistor individually; do this before you connect the resistors together. • Place the resistors to match the resistor orientations shown in Figure 2.2 on the facing page. • The circuit need not connect to the myDAQ analog ground AGND terminal; only Multisim requires the ground connection. NI myDAQ video tutorials: • DMM ohmmeter: http://decibel.ni.com/content/docs/DOC-12938