Activity 9: Parallel Circuit
Introduction:
Learning Objectives:
After successful completion of this activity, students should be able to:
• Compute and measure resistance and currents in parallel circuit.
• Demonstrate that the total resistance in a parallel circuit decreases as resistors are
added.
Materials:
***For this specific activity, the Tinkercad simulation software will be utilized. Make sure that
this application is available into your devices.
Procedures:
1. Connect R1 and R2 as shown in the figure. Then measure the total resistance and enter measured
value to Table 1.
Table 1
Total Resistance RT (measured)
Total Resistance RT (computed)
R1||R2
1.94 k
R1||R2||R3
1.51 k
R1||R2||R3||R4
2. Add R3 in parallel with R1 and R2. Measure the parallel resistance of all three resistors. Then add
R4 in parallel with the other three resistors and repeat the measurement. Record your results in Table
1.
3. With the parallel combinations R1 and R2, compute for the total resistance. Then add R3 in parallel
with R1 and R2 and compute for the total resistance. Repeat by adding R4 to the other three resistors.
Record computed values in table 1.
4.Construct the circuit shown and measure the total current in the circuit.
5. Measure the voltage across each resistor and enter values in table 2.
Table 2
Parameters
Values
ITOTAL
V1(Measured)
V2(Measured)
V3(Measured)
V4(Measured)
I1(Computed)
I2(Computed)
I3(Computed)
I4(Computed)
I1(Measured)
I2(Measured)
I3(Measured)
I4(Measured)
6. Use Ohm’s law to compute the branch currents across each resistor. Use the source voltage and
the given resistance values. Tabulate results in table 2.
7. Using an ammeter, this time measure the branch currents across each resistor and enter values in
table 2.
8. Using Kirchoff’s Current Law, compute the total current using the measured and computed value
and compare results. Are there any differences?
Results and Discussion:
1. Attached pictures (Proof) of working circuit for procedure 1.
2. Attached pictures (Proof) of working circuit for procedure 2.
3. Attached pictures (Proof) of working circuit for procedure 3.
4. Attached pictures (Proof) of working circuit for procedure 4.
5. Attached pictures (Proof) of working circuit for procedure 5.
6. Attached pictures (Proof) of working circuit for procedure 7.
7. Computations on procedure 6
8. Explanation for procedure 8.
Questions to Answer:
Conclusion:
Reflections:
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