The combination of circuit is the utmost important piece of study to understand the basic concept of how exactly current flows in the Electronics circuit because every PCB (**Printed Circuit Board**) contains multiple of tracks. I am providing you **series circuit MCQs** multiple choice questions and answers with the aim to facilitate the students, technicians and teachers of different technical fields throughout the world.

**Read More: MCQs on Parallel Circuits with Answer Key**

__Series Circuit – Definition__

__Series Circuit – Definition__

In a series circuit, the components are connected in such a way that the current flows in a single path that means current first flow through the first component then flow second and again next one.

**Series Circuit MCQs (Questions and Answers)**

**Q1. The total resistance R of a _________ circuit is equal to the sum of the individual resistances.**

- Parallel Circuit
- Series Circuit
- Series Parallel Circuit
- all are correct

**Answer: b**

**Q2. The formula of Total Series Resistance is _________________**

- Rtotal = R1 + R2 + R3
- Rtotal = R1 ± R2 ± R3
- Rtotal = R1 × R2 × R3
- Rtotal = R1 / R2 × R3

**Answer: b**

**Q3. Three Resistances of R1=20Ω , ** **R2=57Ω & R1=90Ω are is series then how will the total resistance?**

- 167
**Ω** - 90
**Ω** - 57
**Ω** - 20
**Ω**

**Answer: a**

**Q4. When current flows through a resistance, electrical energy is converted into ___________ energy.**

- Chemical
- Heat
- Light
- Elastic

**Answer: b**

**Q5. Whenever, any machine or device connected with the ground is called______________.**

- Grounding
- Earthing

**Answer: a**

**Q6. Electrically isolated means that the infinite resistance between ground point. True/False**

**Answer: True **

**Q7. If using double subscript notation, then first letter indicates ________ and the second letter indicate reference.**

- Measurement
- Increment
- Subscription
- Solution

**Answer: a**

**Q8. The meaning of troubleshooting in electronics and electrical circuit is _________________.**

- Diagnose
- Analyse
- Solution
- all are correct

**Answer: d**

**Q9. ****When the current path/track damaged (means Zero Current) in a series circuit then it is called _________________.**

- Short Circuit
- Open Circuit
- Bypassed Circuit
- All are correct

**Answer: b**

**Q10. The IR voltage across each resistance is called an ___________________.**

- IR drop
- Voltage drop
- Power drop
- a & b are correct

**Answer: d **

**Q11. __________states that the sum of all resistor voltage drops in a series circuit equals the applied voltage.**

- Ohm’s Law
- Kirchhoff’s voltage law (KVL)
- Kirchhoff’s current law (KCL)
- b & c are correct

**Answer: b**

**Q12. In a _________Circuit, current is Same in the all part/component.**

- Series
- Parallel
- String
- a & c are correct

**Answer: d**

**Q13. The formula to calculate Current (I) in Series Resistance Circuit is ___________________.**

- I = V/R
- I = I^2 × R
- I = V× R
- I =
**V**total /**R**total

**Answer: d**

**Q14. When components are connected in successive order is called _______________.**

- Series Circuit
- Parallel Circuit
- Series Parallel Circuit
- all are correct

**Answer: a**

**Q15. A combination of _________ resistances is often called string.**

- Parallel Circuit
- Series Circuit
- Series Parallel Circuit
- all are correct

**Answer: b**

**Q16. Total voltage (V**total**) in Series circuit is equal to the sum of individual resistance. True/False**

**Answer: True **

**Q17. The total power in a series circuit is the _____________ of individual powers.**

- Sum
- Minus
- Divide
- Multiply

**Answer: a **

**Q18. In the series circuit, high value of Resistor dissipates more power rather than low value resistor. True/False**

**Answer: True **

**Q19. The formula to calculate the power dissipates against any Resistor is _________________.**

- P = W/Q
- P = I^2 × R
- P = VR
- P = IR

**Answer: b **

**Q20. When two applied voltages are connected in series-aiding mode then Vtotal will be sum of all voltages. True/False**

**Answer: True ****[Series-Aiding Polarity Mode: **when the plus(+) terminal of applied voltage source is connected to the negative(-) terminal of the next applied voltage source**]**

**Q21. When two applied voltages are connected in series-opposing mode then Vtotal will be sum of voltages. True/False**

**Answer: False ****[Series-Opposing Polarity Mode: **when the plus (+) terminal of applied voltage source is connected to the Plus (+) terminal of the next applied voltage source**]**

**Q22. If two series-opposing voltages are equal then the sum of all voltages will be _______________.**

- Infinity
- Zero
- Equal to First Applied Voltage
- Equal to Second Applied Voltage

**Answer: b**

**Q23. ****The reference point in electronic schematic circuit is know as _____________ which is equal to 0 volts.**

- Ground
- GND
- Feedback
- a & b are correct

**Answer: d**

**Q24. The resistance of an open series circuit is _____________.**

- High
- Low
- Extremely High (Infinity)
- Extremely Low

**Answer: ****c**

**Q25. The resistance of the short circuit (**comparing to open circuit

**) is _____________.**- Zero
- Maximum
- Infinity
- Low

**Answer: ****a**