Series Circuits — Engineering Board Exam Practice Questions

22 free engineering board exam reviewer questions on Series Circuits (DC Circuits), each with the correct answer and a worked solution.

  1. Three resistors R1=3 k , R2=2 k , and R3 are in series across a 12 V battery. A voltmeter across R2 reads 4 V. Find R3.
  2. In a series string across 48 V, the voltage across R1 is three times the voltage across R2, and nothing else is in the circuit. If R2=4 k…
  3. In the series circuit shown, V=60 V, R1=2, , R2=27, , R3=86, , and R4=5, . Find the voltage across R2.
  4. In the series circuit shown, V=48 V, R1=3, , R2=129, , and R3=60, . If R2 is accidentally short-circuited, what is the new current?
  5. The circuit shown has V=12 V, R1=60, , and R3=4, . The ammeter reads 100 mA. Find the unknown resistance Rx.
  6. Resistors of 10 k , 22 k , and 47 k are connected in series across a 12 V source. Find the voltage across the 22 k resistor.
  7. A 12 V battery and a 6 V battery are connected in series so that they aid each other, across a 9, resistor. Find the current.
  8. Two resistors in the ratio R1:R2=2:3 are connected in series across a 50 V source. What is the voltage across R2?
  9. The circuit shown has V=100 V and R2=24 k . The ammeter reads 4 mA. Find the unknown resistance Rx.
  10. In the series circuit shown, V=100 V, R1=24, , R2=22, , and R3=4, . Find the voltage at point B with respect to the negative terminal of…
  11. In the series circuit shown, V=9 V, R1=3.3 k , and R2=5.7 k . Find the voltage at point A with respect to the negative terminal of the…
  12. In the series circuit shown, V=30 V, R1=1 k , R2=23.4 k , and R3=5.6 k . Find the total power delivered by the source.
  13. In the series circuit shown, V=60 V, R1=19, , and R2=5, . How much power is dissipated by R1?
  14. In the series circuit shown, V=24 V, R1=33, , R2=27, , and R3=60, . How much power is dissipated by R2?
  15. In the series circuit shown, V=48 V, R1=36, , R2=80, , and R3=76, . Find the voltage across R1.
  16. In the series circuit shown, V=24 V, R1=10, , R2=2, , R3=36, , and R4=12, . Find the voltage across R3.
  17. In the series circuit shown, V=48 V, R1=44, , R2=12, , and R3=24, . Find the voltage across R2.
  18. According to Kirchhoff's voltage law, in a series circuit the sum of the voltage drops across the resistors equals
  19. In the series circuit shown, V=48 V, R1=24, , R2=22, , and R3=50, . Find the current in the circuit.
  20. In the series circuit shown, V=24 V, R1=36, , and R2=12, . Find the current in the circuit.
  21. In the series circuit shown, V=9 V, R1=48, , R2=15, , and R3=27, . Find the total resistance.
  22. In the series circuit shown, V=30 V, R1=800, , and R2=2.2 k . Find the total resistance.