Introduction To EET Lab Activity 3 Series & Parallel .

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EET 150Introduction to EETLab Activity 3Series & Parallel Circuits with Solderless BoardsRequired Parts, Software and EquipmentPartsFigures 1 and 2 CircuitsComponent /ValueResistor 1000 Ω, ¼ Watt, 5% ToleranceResistor 10 kΩ, ¼ Watt, 5% ToleranceResistor 2.2 kΩ, ¼ Watt, 5% ToleranceQuantity121EquipmentRequiredSolderless Experimenters' BoardDc power supplyDigital MultimeterHookup wire (22 AWG)Wire cutter/stripperOptionalAlligator clip leads3 Banana jack leads red/blackSoftwareMS WordFall 20171Lab3 ET150.docx

EET 150Introduction to EETLab Activity 3Series & Parallel Circuits with Solderless BoardsIntroductionElectronics circuits are comprised of combinations of series and parallel systems. Series circuitshave all parts connected in a row. There is only one path for current to travel through thecircuit. The voltage drops across each component will equal to the total voltage applied to thecircuit. Figure 1 shows a simple series circuit comprised of a single battery and four resistors.The current can only flow in one path around the circuit. The black dots at the ends of thecomponents are called nodes. A node in circuit theory connects two or more circuitcomponents together.The voltage drops across each resistor will add up to the supply voltage, which is 10 V in thisexample. Stated as an equation this would be:VR1 VR2 VR3 VR4 10VIn circuit theory this is called Kirchhoff’s Voltage Law (KVL). The total resistance of the circuitwill equal all the resistances added together. The mathematical formula for this is:RT R1 R2 R3 R4.This formula applies to all series connected resistors. The only difference is the number ofresistor values summed on the right hand side of the equation.VR1R11kVR2R21kVR3R31k V110VVR4R41kFigure 1. Simple Series Circuit with ResistancesParallel circuits share a common voltage and the current is divided through the multiple parallelpaths. Figure 2 shows a simple parallel circuit comprised of resistors and a dc source shown as abattery. Notice how each resistor has a common node from the positive part of the supply anda common node with the negative/ground of the power supply. The total current entering thecircuit will equal the summation of all the parallel branch currents. This can be statedmathematically as:IT I1 I2 I3 I4Fall 20172Lab3 ET150.docx

EET 150Introduction to EETLab Activity 3Series & Parallel Circuits with Solderless BoardsThe fact that all current that enters a node must leave a node through the other paths is calledKirchhoff’s Current Law (KCL). These two laws along with Ohm’s law are the foundation ofelectric circuit theory and analysis.IT V110VR1I1R2I2R3I3R4I4Figure 2. Simple Parallel Circuit with Resistors and Battery Source.In parallel circuits, the value of total circuit resistance approaches the smallest resistance in theparallel combination. For example, if there is a parallel circuit that contains two resistors, one1 kΩ and one 10 kΩ resistors, the total resistance will approach 1 kΩ. This can be stated in theformula that follows for the four resistor circuit shown in Figure 2.RT 11111 R1 R 2 R 3 R 4This can be generalized to any number of parallel resistors by adding or removing the reciprocalterms in the denominator of the equation. The general equation for n many parallel resistorsis:RT 11111 .R1 R 2 R 3RnObjectiveThe objective of this lab is to familiarize students with solderless experiment boards (SEB),series circuits, and parallel circuits. Student will assemble series and parallel circuits using theSEB, a voltage source, and resistor values. Students will measure the voltage drops in a seriescircuit, total resistances of both series and parallel circuits. They will compare the measuredvalues to the calculated values using the series and parallel total resistance formulas and thelabeled values of resistances.Fall 20173Lab3 ET150.docx

EET 150Introduction to EETLab Activity 3Series & Parallel Circuits with Solderless BoardsProcedure:1. Construct circuit below. On-Campus Students: Use the dc supply found in the lab forthe 10 volt source. On-line Students: Use the dc supply specified in the equipment listfor the program. Measure the values of each resistor while constructing the circuit andplace the readings in Table 1.R11kR210kR310kR42.2k V110VFigure 3. Series Circuit2. Remove the dc source and measure the total resistance of the circuit. Place the value inTable 1. Use the series resistance formula to compute the total resistance using thelabeled resistor values.3. Measure the voltage drop across each resistor, place the values in the table4. Construct circuit below. On-Campus Students: Use the dc supply found in the lab forthe 10 volt source. On-line Students: Use the dc supply specified in the equipment listfor the program. V110VR11kR210kR310kR42.2kFigure 4. Parallel Circuit5. Remove the dc source and measure the total resistance of the circuit. Place the value inTable 2. Use the parallel resistance formula and the labeled resistor values to computethe total circuit resistance. Place this value in Table 2 also.6. Measure the voltage drops across each resistor and place the readings in Table 2.Fall 20174Lab3 ET150.docx

EET 150Introduction to EETLab Activity 3Series & Parallel Circuits with Solderless BoardsDiscussion PointsWhat is the sum of the voltage for the series circuit? Does this validate Kirchhoff’s voltage law?What is the sum of the individual resistances in the series circuit? How does this compare tothe measured value? How does the computed total resistance compare to the measuredresistance of the parallel circuit? Does the total resistance of the parallel circuit approachlowest resistance value in the circuit?R1R2R3R4RTR1R2R3R4RTFall 2017Table 1- Figure 3 Series Circuit MeasurementsResistances (Ohms)Resistor Voltages (Volts)Measured Labeled/ComputedMeasured VVR1VR2VR3VR4SumTable 2-Figure 4 Parallel Circuit MeasurementsResistances (Ohms)Resistor Voltages (Volts)Measured Labeled/ComputedMeasured VVR1VR2VR3VR45Lab3 ET150.docx

Lab Activity 3 Series & Parallel Circuits with Solderless Boards Fall 2017 2 Lab3_ET150.docx Introduction Electronics circuits are comprised of combinations of series and parallel systems. Series circuits have all parts connected in a row. There is only one path for current to travel through the circuit.

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