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series parallel circuits MCQs

Practise focused series parallel circuits questions with marked answers for exam preparation and subject revision.

series parallel circuits Mcqs
1. The parallel combination of a 6.8 k? resistor and a 10 k? resistor is in series with the parallel combination of a 2.2 k? resistor and a 1 k? resistor. A 100 V source is connected across the circuit. The resistor(s) with the greatest voltage drop is (are)___________?
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A. 6.8 k?

B. 2.2 k?

C. 2.2 k? and 1 k?

D. 6.8 k? and 10 k?
2. The parallel combination of a 470 ? resistor and a 1.2 k? resistor is in series with the parallel combination of three 3 k? resistors. A 200 V source is connected across the circuit. The resistor with the most current has a value of____________?
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A. 470 ?

B. 3 k?

C. 1.2 k?

D. 470 ? or 1.2 k?

3. Three 10 k? resistors are connected in series. A 20 k? resistor is connected in parallel across one of the 10 k? resistors. The voltage source is 24 V. The total current in the circuit is___________?
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A. 900 ?A

B. 800 ?A

C. 90 mA

D. 9 mA

4. In a certain five-step R/2R ladder network, the smallest resistor value is 1 k?. The largest value is___________?
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A. Indeterminable

B. 10 k?

C. 20 k?

D. 2 k?
5. A voltage divider consists of two 100 k? resistors and a 12 V source. What will the output voltage be if a load resistor of 1 M? is connected to the output?
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A. 0.57 V

B. 5.7 V

C. 12 V

D. 6 V

6. A voltage divider consists of two 68 k? resistors and a 24 V source. The unknown output voltage is______________?
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A. 6 V

B. 0 V

C. 24 V

D. 12 V
7. A certain voltage divider consists of three 1 k? resistors in series. Which of the following load resistors will have the least effect on the output voltage?
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A. 100 k?

B. 330 ?

C. 1 M?

D. 1 k?

8. Two 3.3 k? resistors are in series and this series combination is in parallel with a 4.7 k? resistor. The voltage across one of the 3.3 k? resistors is 12 V. The voltage across the 4.7 k? resistor is_________?
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A. 12 V

B. 0 V

C. 6 V

D. 24 V
9. If R1 is in series with parallel connected to R2 and R3, what happens to total current if R2 opens?
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A. increases

B. remains the same

C. cannot tell

D. decreases
10. The parallel combination of a 470 ? resistor and a 1.5 k? resistor is in series with the parallel combination of five 1 k? resistors. The source voltage is 50 V. The percentage of the load current through any single 1 K? resistor is__________?
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A. 50%

B. 100%

C. 20 %

D. 25%

11. A certain Wheatstone bridge has the following resistor values: R1 = 10 k?, R2 = 720 ?, and R4 = 2.4 k?. The unknown resistance is_____________?
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A. 2.4 ?

B. 300 ?

C. 3,000 ?

D. 24 ?

12. The current flowing through an unloaded voltage divider is called the____________?
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A. resistor current

B. bleeder current

C. load current

D. voltage current

13. A Wheatstone bridge can be used to determine an unknown_____________?
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A. current

B. resistance

C. voltage

D. power

14. With 21 V applied, if R1 = 5 ohms, R2 = 35 ohms, and R3 = 14 ohms, what is the current of R2 if R1 is series connected with parallel circuit R2 and R3?
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A. 200 mA

B. 600 mA

C. 800 mA

D. 400 mA
15. A device able to supply electrical energy is a __________?
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A. battery

B. conductor

C. nonconductor

D. microwave

16. The positive (+) and negative (-) ends of the battery are called ___________?
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A. battery knobs

B. circuit diagram

C. battery sides

D. battery terminals
17. In a seriesparallel circuit consisting of R1 and R2 in series and connected in parallel with R3, if R1 opens, then R2s voltage will:___________?
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A. increase

B. cannot tell

C. remain the same

D. decrease
18. In a seriesparallel circuit, individual component power dissipation are calculated using_____________?
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A. a percent of the voltage division ratio squared

B. a percent of the total power depending on resistor ratios

C. individual component parameters

D. total current squared multiplied by the resistor values

19. A certain voltage divider consists of two 12 k? resistors in series. Which of the following load resistors will have the most effect on the output voltage?
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A. 24 k?

B. 18 k?

C. 12 k?

D. 1 M?

20. The parallel combination of a 470 ? resistor and a 680 ? resistor is in series with the parallel combination of four 2 k? resistors. The total resistance is___________?
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A. 1,650 ?

B. 77.8 ?

C. 1,078 ?

D. 778 ?
21. A 6 V battery output is divided down to obtain two output voltages. Three 2.2 k? resistors are used to provide the two taps. The two output voltages are___________?
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A. 2 V, 4 V

B. 2 V, 6 V

C. 4 V, 6 V

D. 2 V, 2 V

22. The internal resistance of a 20,000 ohm/volt voltmeter set on its 5 V range is_____________?
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A. 20,000 ?

B. 200,000 ?

C. 1,000,000 ?

D. 100,000 ?
23. When a Wheatstone bridge is in a balanced condition, the center voltmeter in the bridge will read_____________?
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A. the same as the source voltage

B. twice the source voltage

C. zero volts

D. half the source voltage

24. The first goal to accomplish in analyzing a complex series-parallel circuit is to____________?
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A. equate all series components

B. equate all parallel components

C. solve for the total current and resistance

D. solve for all the voltage drops

25. Two 1.2 k? resistors are in series and this series combination is in parallel with a 3.3 k? resistor. The total resistance is____________?
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A. 5,700 ?

B. 138 ?

C. 880 ?

D. 1,389 ?
26. A balanced Wheatstone bridge consists of an RV of 3,500 ?, an R2 of 200 ?, and an R3 of 680 ?. The value of RUNK is____________?
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A. 680 ?

B. 880 ?

C. 1,029 ?

D. 200 ?

27. A 12 k? resistor, a 15 k? resistor, and a 22 k? resistor are in series with two 10 k? resistors that are in parallel. The source voltage is 75 V. Current through the 15 k? resistor is approximately___________?
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A. 5 mA

B. 1.4 mA

C. 14 mA

D. 50 mA

28. On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?
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A. 500 V

B. 1,000 V

C. 50 V

D. 1 V

29. A certain circuit is composed of two parallel resistors. The total resistance is 1,403 ?. One of the resistors is 2 k?. The other resistor value is____________?
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A. 4.7 k?

B. 1,403 ?

C. 2 k?

D. 3,403 ?