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Electrotech Toolbox Reinforcement Activity Parallel measurement Step 1 Access the following equipment: 12 volt power source 1 x 12Ω, 2 x 4Ω resistors connecting wires multimeter (or individual ammeter, voltmeter and ohmmeter). Or A circuit board for training purposes containing the above components, a suitable power source and meters. Step 2 Connect up the circuit shown below. Note: If you are having any difficulty or are unsure how to connect this circuit, see your trainer for assistance and advice. Step 3 Set the power source to 12V and turn on. Measure the voltage drop at V1 and V2 and the current flow at A1, A2 and A3. Turn off the power source and write your measured values in the following table. UEENEEE004B Solve problems in multiple path DC circuits © Commonwealth of Australia 2009 | Licensed under AEShareNet – S Licence Parallel measurement - reinforcement Disclaimer and copyright Page 1 of 5 Electrotech Toolbox Reinforcement Activity Measured value Predicted value Difference between measured and predicted values Voltage at V1 Voltage at V2 Current through A1 Current through A2 Current through A3 Step 4 Using the appropriate formula, calculate the predicted values you have measured. Place these values in the table above. Calculate the difference between measured and predicted values and place in table. Note: In the following area, show the formula you have used and your calculations. Briefly explain possible reasons for a difference between measured and predicted values. UEENEEE004B Solve problems in multiple path DC circuits © Commonwealth of Australia 2009 | Licensed under AEShareNet – S Licence Parallel measurement - reinforcement Disclaimer and copyright Page 2 of 5 Electrotech Toolbox Reinforcement Activity Step 5 Change your circuit to reflect the resistance values shown below. Step 6 Set the power source to 12V and turn on. Measure the voltage drop at V1, V2 and V3 and the current flow at A1, A2, A3 and A4. Turn off the power source and write your measured values in the following table. Measured value Predicted value Difference between measured and predicted values Voltage at V1 Voltage at V2 Voltage at V3 Current through A1 Current through A2 Current through A3 Current through A4 UEENEEE004B Solve problems in multiple path DC circuits © Commonwealth of Australia 2009 | Licensed under AEShareNet – S Licence Parallel measurement - reinforcement Disclaimer and copyright Page 3 of 5 Electrotech Toolbox Reinforcement Activity Step 7 Using the appropriate formula, calculate the predicted values you have measured. Place these values in the table above. Calculate the difference between measured and predicted values and place in table. Note: In the following area, show the formula you have used and your calculations. Briefly explain possible reasons for a difference between measured and predicted values. UEENEEE004B Solve problems in multiple path DC circuits © Commonwealth of Australia 2009 | Licensed under AEShareNet – S Licence Parallel measurement - reinforcement Disclaimer and copyright Page 4 of 5 Electrotech Toolbox Reinforcement Activity Step 8 Answer the following questions related to this activity. What did you notice about the current flow through A1 in relation to the flow through the parallel branch? What did you notice about the voltage across the resistors in the parallel branch? What did you notice about the total current flow when an additional resistor was added to the parallel branch (eg step 5)? Step 9 Present your completed task sheet to your trainer for feedback. Note: This completed task sheet can be saved as evidence of work completed. UEENEEE004B Solve problems in multiple path DC circuits © Commonwealth of Australia 2009 | Licensed under AEShareNet – S Licence Parallel measurement - reinforcement Disclaimer and copyright Page 5 of 5