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TECH-1811 Electronic Circuit Technology
Laboratory Assignment #4 – Series Circuit with KVL & Voltage Divider Rule
Objectives:
1. To verify the total resistance of a series circuit.
2. To verify Ohm’s Law in a series circuit.
3. To verify Kirchhoff’s Voltage Law in a series circuit.
4. To verify the Voltage Divider Rule (Formula).
5. To verify power dissipation in a series circuit.
Materials/Equipment:
Resistors: 1 k, 1.5 k & 3.3 k
Digital Multi-meter
K&H Analog Trainer
R1 =
1 kΩ
R2 =
1.5 kΩ
R3 =
3.3 kΩ
+
Vs =
- 11.6 V
Figure #1: Series Circuit
Pre-Lab Preparation:
1. Calculate the total series nominal resistance of the circuit in Figure #1 and record.(all three
in series).
2. Using Ohm’s Law and VS = 11.6 VDC, calculate the total series current flowing in the
circuit and record.
3. Calculate the voltage drop across the individual resistors using Ohm's Law and the current
value from Step #2 and record. (Remember: IT = IR1 = IR2 = IR3 = IRn)
TECH-1811 Electronic Circuit Technology
Laboratory Assignment #4 – Series Circuit with KVL & Voltage Divider Rule
Procedure:
1. Use color codes to determine resistor nominal values and record nominal values.
2. Measure all three resistors using the DMM and record the actual values.
3. Connect resistors in series, isolate them from power and measure total series resistance
with the DMM and record.
4. Adjust the 0 to +15 VDC Variable Power Supply to 11.6 VDC and connect to the series
circuit. Apply power and measure the individual resistor voltages(VR1, VR2, and VR3) and
record the data. From your readings of the measured voltages, is Kirchhoff's Voltage Law
(KVL) satisfied around the current path? Does VS = VR1+VR2+VR3? How do the measured
voltages compare to your pre-lab calculations? Compare the magnitudes of the
resistances used in the circuit and the magnitudes of the voltage drops across the
resistors.
5. Calculate the current through each resistor using the measured voltage across each
resistor and the measured resistor value and record. How do the individual resistor
currents compare to each other? How do these values compare to your pre-lab
calculations for total series current?
6. Calculate each resistor voltage drop using the Voltage Divider Formula and the actual
values of the source voltage, total resistance, and each resistor. How do these values
compare with the measured resistor voltages?
7. Using the calculated current from Step #5 and the measured resistor voltages, calculate the
power dissipated by each resistor and record. Calculate the total power in the circuit and
compare it with the individual resistor power dissipations.
8. On engineering paper, turn in a title page (see Formal Lab Report Guide for a sample title
page). All calculations should include properly set up equations plugging in values and the
solution. Data collected from the lab should be in an appropriate format – ie statement, table,
diagram. In a separate section (called “discussion”) answer all the questions in the procedure
and related the answers back to the data collected (labeling tables will make this easier).
Discuss any errors and their possible causes. Lastly redraw the circuit in Cadence and
submit a printout of the schematic.