# Series Circuits MCQ Questions & Answers

Series Circuits MCQs : This section focuses on the "Series Circuits". These Multiple Choice Questions (MCQs) should be practiced to improve the Series Circuits skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

What is the voltage measured across a series short?

A. Infinite
B. Zero
C. The value of the source voltage
D. Null

Question 2

If series current doubles, then:

A. resistance is halved
B. voltage is doubled
C. voltage is reduced
D. resistance is doubled

Question 3

If three resistors of 1.5 kilohms, 470 ohms, and 3300 ohms are in series with a 25-volt source, what is the total circuit current?

A. 210 mA
B. 5.2 mA
C. 4.7 mA
D. .007 A

Question 4

Resistance in a series circuit will:

A. control the voltage
B. double the current
C. halve the power
D. oppose current

Question 5

The voltage drop across a series resistor is proportional to what other value?

A. total resistance
B. its own resistance
C. wattage rating
D. the amount of time the circuit is on

Question 6

A series circuit schematic is recognized because all the components are connected:

A. diagonally across the page
B. in a uniform vertical manner
C. end to end in a "string"
D. horizontally across the page

Question 7

A series circuit current:

A. remains the same through each component
B. is the same as the individual resistances
C. is subtracted by each component
D. varies through each component

Question 8

A voltage across a series resistor circuit is proportional to?

A. The amount of time the circuit was on for
B. The value of the resistance itself
C. The value of the other resistances in the circuit
D. The power in the circuit

Question 9

With 20 V applied, an 8-ohm resistor is in series with a lamp. When the lamp is removed, what voltage will be read across the lamp socket?

A. 0 V
B. 8 V
C. 12 V
D. 20 V

Question 10

If 5 V and 16 V power supplies are connected in series-opposing, what is the total voltage?

A. 11 V
B. 16 V
C. 21 V
D. 80 V

Question 11

Which equation determines individual resistor voltage drop?

A. V x R
B. I2 x R
C. V x I
D. I x R

Question 12

In a series circuit, which of the parameters remain constant across all circuit elements such as resistor, capacitor and inductor etcetera?

A. Voltage
B. Current
C. Both voltage and current
D. Neither voltage nor current

Question 13

A short circuit has:

A. too much resistance
B. no conductance
C. no resistance
D. low current

Question 14

If we apply a sinusoidal input to RL circuit, the current in the circuit is __________ and the voltage across the elements is _______________

A. square, square
B. square, sinusoid
C. sinusoid, square
D. sinusoid, sinusoid

Question 15

In a series circuit, the voltage measured across a short will be:

A. source voltage
B. infinite voltage
C. zero volts
D. the normal voltage drop

Question 16

Many resistors connected in series will?

A. Divide the voltage proportionally among all the resistors
B. Divide the current proportionally
C. Increase the source voltage in proportion to the values of the resistors
D. Reduce the power to zero

Question 17

What happens to the current in the series circuit if the resistance is doubled?

A. It becomes half its original value
B. It becomes double its original value
C. It becomes zero
D. It becomes infinity

Question 18

Kirchhoff’s voltage law states that:

A. the sum of the voltage drops in a series circuit is equal to the total applied voltage
B. the algebraic sum of the resistances is equal to the sum of the voltages
C. the algebraic sum of the individual currents around a closed loop is zero
D. the voltages developed across each element in a series circuit are identical

Question 19

With a 900 V source, voltage is divided across 3 series resistors of 300 V, 280 V, and:

A. 30 V
B. 270 V
C. 320 V
D. 900 V

Question 20

If two resistors have the same voltage drop in a series circuit, it means:

A. they are connected in parallel
B. they are of unequal value
C. the voltage has doubled
D. they are of equal value

Question 21

What determines the total resistance in a series circuit?

A. the largest resistor
B. the sum of the resistors
C. the largest resistor minus the smaller
D. the smallest resistor

Question 22

Power is defined as:

A. the rate at which work is done
B. work
C. the conversion of energy
D. joules

Question 23

Given a series circuit containing resistors of different values, which statement is not true?

A. The current through each resistor is the same.
B. The sum of the voltage drops across each resistive element will be equal to source voltage.
C. The total resistance is the sum of the value of the resistors.
D. The voltage drop across each resistor is the same.

Question 24

If the resistance total in a series circuit doubles, current will:

A. be the same
B. be doubled
C. reduce source voltage
D. be halved

Question 25

How will an open resistor affect a series circuit?

A. Current will flow around the open resistor.
B. The open resistor will drop 0 V.
C. Total resistance will decrease.
D. No current will flow in the circuit.

Question 26

One of the most common applications of a potentiometer is as an adjustable voltage divider, also known as

A. voltage control
B. current control
C. volume control
D. divider control

Question 27

If series resistors dissipate 16 mW, 107 mW, 146 mW, and 243 mW, what is the total power consumed by the circuit?

A. 128 mW
B. 269 mW
C. 512 mW
D. 1024 mW

Question 28

When a battery is connected to a series circuit, it delivers current based only upon:

A. primary/secondary difference
B. total resistance
C. the polarity connections
D. average resistance

Question 29

A string of resistors in a series circuit will:

A. divide the source voltage in proportion to their values
B. reduce the power to zero
C. cause the current to divide
D. increase the source voltage in proportion to the values

Question 30

With a total resistance of 3300 ohms and a 45 V source, if R3 is 1200 ohms, what will be its voltage drop?

A. 16.36 V
B. 32.72 V
C. 10.90 V
D. 15.00 V

Question 31

If there are two bulbs connected in series and one blows out, what happens to the other bulb?

A. The other bulb continues to glow with the same brightness
B. The other bulb stops glowing
C. The other bulb glows with increased brightness
D. The other bulb also burns out