Lab 6 Combination of Series and Parallel Circuits (Using Ph ET Simulation Tool) PDF

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Nhat Nguyen Lab 6 Combination of Series and Parallel Circuit 3/2/21

Lab 6 Combination of Series and Parallel Circuit (Using PhET Simulation Tool) Objective 1. Learn to build up a combination of series and parallel circuit with three resisters. 2. Use PhET interactive simulation tool (Circuit Construction Kit AC Prototype) to build the circuits and Verify Ohm’s Law

Theory Combination of Series and Parallel Circuit

1 1 1 = + (1) R 12 R1 R2 I 12 =I 1 +I 2 (2) ∆ V 12 =∆V 1 =∆ V 2 (3) Rtotal = R12 + R3 (4) I total = I 12 =I 3 (5) Figure 1 Two resister in series

∆ V = ∆ V 12 + ∆ V 3 (6)

Equipment PhET interactive simulation tool (Circuit Construction Kit: DC - Virtual Lab) https://phet.colorado.edu/en/simulation/circuit-construction-kit-dc-virtual-lab

Procedures Build the circuit as shown in Figure 1 by using PhET Simulation Tool 1. Click the above http link, you will see

2. Click ▲, you will see

3. Now you can build your circuit by using “wire”, “Battery” and “Resistor”

4. You can tap the circuit elements to change it value by adjust

5. You can also toggle between the battery and the battery symbol as shown above. 6. Use the circuit board, build a combination of series and parallel circuit by using three resisters as shown in the following figure 2: set up R1=50 Ω , R2 =80.0 Ω , R2 =20.0 Ω , ∆ V =5.0 V

Figure 2

7. Measure the voltage across each resister, and the voltage across over the two R1

and

R2

(resister R12 ) Record the values on the table 1.

How to use the circuit board tool Voltmeter to measure the voltage Simple drag the Voltmeter to the necessary location as shown in the following figure.

8. Using Ohm’s law calculate the currents for each resister and put the values on table 1. 9. Using circuit board tool Ammeters measure the current passing through each resister, and the current going through the two R1 and R2 (resister R12 ). Record the values on the table 1. Note that the Ammeters should be in series with the resister. (The figure below show you how to cut a circuit open and then put the Ammeters)

10.

C o m

pare measured current in column 3 and calculated current in column 4 in the table 1, and find the percentage error. Data Table 1 R1

Resistance:

R2 :________80

:________50___

____

R3 :____20____ ____

1

2

3

4

5

Measured Voltage

Calculated Current (Using Ohm’s Law)

Measured Current

Calculated Current (Using Equation 1-6)

% error (compare

R1

-3.03

0.00059

0.05

0.0606

1%

R2

-3.03

0.037875

0.04

0.037875

5.3%

R3

-1.97

0.0985

0.10

0.0985

1.5%

R12

3.03

0.023307

0.10

0.0985

1.5%

column 3 and 4)

Your Lab Report Should Include the Following 1. Lab theory: Test if Ohms law is correct, measure voltage across each resistor then find current via Ohms law, after that measure current from the circuit and compare measured and calculate current.

2. Your build circuit photo

3. Procedures: connect circuit diagram, find voltage and current, calculate currents from measured voltage, compare measured and calculated current. 4. Your circuit setup photo which shows voltage V 12 [across the two R1 and R2 (resister R12 )] measurement; and circuit setup photo which shows current I 12 [pass

through the two resistor

R1

and

R2 (resister R12 ) measurement.

5. Data Table 1 6. Calculation details in column 4 7. Conclusion: In this experiment, we were able to determine the resistance resistor connected in series and parallel combination by measuring the potential difference across the resistors and the current through the resistors and thereby we could determine the net current flowing through both the circuits and the net potential difference of both the circuits....