Parallel measurement

Instructions:

This activity has three sections:

• measure voltage
• measure current flow
• measure resistance.

Note:

• You can print this page and write your answers onto it.

 

Parallel circuit diagram

Instructions:

• look at the circuit diagram
• observe voltage and resistance values
• print or draw the diagram for future reference.

 

 

 

Section 1 – Measure voltage

Instructions:

You'll be shown a connected parallel circuit. You'll need to:

• answer questions about meter connection
• answer questions about voltage readings
• write down your answer.

 

1. When using a multimeter for measuring voltage, what should you do?

1. Check the circuit polarity.
2. Connect the circuit to a power supply.
3. Remove or isolate the power source.
4. The first two answers are correct.

 

2. Select the meter reading you'd expect for this voltage test.

1. 0.12 mV
2. 12 KV
3. 12 A
4. 120 V
5. 12 V
6. 12 mΩ
7. -12 V

 

3. Select the meter reading you'd expect for this voltage test.

1. 0.12 mV
2. 12 KV
3. 12 A
4. 120 V
5. 12 V
6. 12 mΩ
7. -12 V

 

4. Will this connection show the voltage across R1?

1. Yes
2. No

 

5. What would voltage measurement across the three resistors determine?

1. Voltage is the same across all resistors in parallel.
2. Voltage is highest at the largest resistor.
3. Voltage is lowest at the largest resistor.

 

Section 2 – Measure amperage

Instructions:

You'll be shown a connected parallel circuit. You'll need to:

• answer questions about using an ammeter
• answer questions about measuring amps at specific points in the circuit
• write down your answer.

Note:

• You can print this page and write your answers onto it.

 

6. When using a multimeter for measuring amperage, what should you do?

1. Connect the ammeter in series with the circuit.
2. Check the circuit polarity.
3. Determine if the measurement will exceed the rating of the meter.
4. All of the above are correct.

 

7. If a ten ohm resistor is connected to a twelve volt power supply, what range would you expect the amps to be?

1. 0 to 2 amps.
2. 0 to 1 milliamps.
3. 10 to 20 amps.
4. 0 to 10 amps.

 

8. Will this connection show the current flow through R1?

1. Yes
2. No

 

9. Select the meter reading you'd expect for this current test.

1. 0.2 A
2. 0.8 A
3. 1.8 A
4. 1.2 A
5. 2A
6. 0.6A
7. 0.002 mA

 

10. Would this ammeter connection show total current for the circuit?

1. Yes
2. No

 

11. Would this ammeter connection show current flow through R1 only?

1. Yes
2. No

 

12. Would this ammeter connection show current flow through R3 only?

1. Yes
2. No

 

Section 3 – Measure resistance

Instructions:

You'll be shown a connected parallel circuit. You'll need to:

• answer a question about meter connection
• answer questions about measuring resistance at specific points in the circuit
• write down your answer.

 

13. Before connecting a multimeter into a circuit for measuring resistance, what should you do?

1. Bypass all resistances.
2. Connect the circuit to a power supply.
3. Remove or isolate the power source.
4. Check the circuit polarity.

 

14. Select the meter reading you'd expect for this resistance test.

1. 10 Ω
2. 60 Ω
3. 20 Ω
4. 12 mΩ
5. 6 Ω
6. 0.2 Ω
7. 90 Ω
8. 1.2 Ω
9. 0.6 Ω

 

15. Select the meter reading you'd expect for the resistance test shown.

1. 10 Ω
2. 60 Ω
3. 20 Ω
4. 12 mΩ
5. 6 Ω
6. 0.2 Ω
7. 800 Ω
8. 15 Ω
9. 0.6 Ω

 

16. Would this ohmmeter connection show the resistance of R1?

1. Yes
2. No

 

17. Would this ohmmeter connection show the resistance of R1?

1. Yes
2. No

 

18. Would this ohmmeter connection show the resistance of R1?

1. Yes
2. No

 

19. What would you notice about the total resistance value in a parallel circuit?

1. It would be higher than any individual resistance in the circuit.
2. It would be equal to the sum of all of the individual resistances.
3. It would be lower than any individual resistance in the circuit.

 

When you have finished:

• show your answers to your trainer
• close this window and choose a new activity from the menu.