Master Kirchhoff's Laws: A Comprehensive Guide for Engineering Science Students

Question 1

According to Kirchhoff's Current Law, the algebraic sum of currents entering a node is equal to the algebraic sum of currents leaving the node.

Accepted Answer

True

Answer

False

Question 2

In a parallel circuit, the equivalent resistance is always lower than the resistance of any individual branch.

Accepted Answer

True

Answer

False

Question 3

Kirchhoff's Laws are based on the principles of conservation of energy and conservation of charge.

Accepted Answer

True

Answer

False

Question 4

Which statement is NOT a law of Kirchhoff?

Accepted Answer

The current through a branch is proportional to the voltage across the branch.

Answer

The sum of the currents entering a junction equals the sum of the currents leaving the junction.

Answer

The sum of the voltage increases around a closed loop equals the sum of the voltage decreases.

Answer

The power supplied to a circuit equals the power dissipated in the circuit.

Question 5

Which unit is used to measure electrical power?

Accepted Answer

Watts

Answer

Volts

Answer

Amperes

Answer

Ohms

Question 6

What is the primary function of a transformer?

Accepted Answer

Increase or decrease voltage

Answer

Increase or decrease current

Answer

Convert alternating current to direct current

Answer

Convert direct current to alternating current

Question 7

Which of the following is NOT a type of electrical fuse?

Accepted Answer

Circuit breaker

Answer

Rewirable fuse

Answer

Cartridge fuse

Answer

Glass fuse

Question 8

As the temperature of a wire increases, its resistance will:

Accepted Answer

Increase

Answer

Decrease

Answer

Remain the same

Answer

Cannot be determined without knowing the material

Question 9

The inductance of a coil is defined as:

Accepted Answer

The ratio of magnetic flux linkage to current

Answer

The ratio of current to magnetic flux linkage

Answer

The product of magnetic flux linkage and current

Answer

The sum of magnetic flux linkage and current

Question 10

Which fundamental law is used to analyze the current flow in electrical circuits?

Accepted Answer

Kirchhoff's Current Law

Answer

Newton's Second Law

Answer

Ohm's Law

Answer

Coulomb's Law

Question 11

According to Kirchhoff's Current Law, at any junction in an electrical circuit, the total:

Accepted Answer

Incoming current equals the total outgoing current

Answer

Incoming current exceeds the total outgoing current

Answer

Voltage is higher than the total resistance

Answer

Power is equivalent to the total energy

Question 12

In a series circuit, the total resistance is:

Accepted Answer

Equal to the sum of the individual resistances

Answer

Greater than the sum of the individual resistances

Answer

Less than the sum of the individual resistances

Answer

Inversely proportional to the sum of the individual resistances

Question 13

In a parallel circuit, the total current is:

Accepted Answer

Equal to the sum of the individual currents

Answer

Greater than the sum of the individual currents

Answer

Less than the sum of the individual currents

Answer

Inversely proportional to the sum of the individual currents

Question 14

Kirchhoff's Voltage Law states that in a closed loop, the total:

Accepted Answer

Voltage gain equals the total voltage drop

Answer

Voltage gain exceeds the total voltage drop

Answer

Current is greater than the total resistance

Answer

Power is equivalent to the total energy

Question 15

What is the base unit of electric current in the SI system?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Farad

Question 16

Which of the following is not a fundamental type of electrical circuit?

Accepted Answer

Radial circuit

Answer

Series circuit

Answer

Parallel circuit

Answer

Mixed circuit

Question 17

What is the effect of increasing the resistance in a simple series circuit?

Accepted Answer

Current decreases

Answer

Current increases

Answer

Voltage increases

Answer

Voltage decreases

Question 18

Which of the following describes Kirchhoff's Voltage Law (KVL)?

Accepted Answer

The total voltage around a closed loop equals zero.

Answer

The total current entering a junction equals the total current leaving the junction.

Answer

The power dissipated by a resistor equals the square of the current flowing through it multiplied by the resistance.

Answer

The voltage across a capacitor equals the capacitance multiplied by the charge stored on it.

Question 19

What is the primary function of a voltmeter?

Accepted Answer

To measure voltage

Answer

To measure current

Answer

To measure resistance

Answer

To measure power

Question 20

Which of the following is not a type of resistor?

Accepted Answer

Capacitor

Answer

Fixed resistor

Answer

Variable resistor

Answer

Thermistor

Question 21

Which of the following correctly states Kirchhoff's Current Law (KCL)?

Accepted Answer

The algebraic sum of the currents entering a junction is equal to the algebraic sum of the currents leaving the same junction.

Answer

The power dissipated in a resistor is equal to the square of the current flowing through it.

Answer

The voltage across a resistor is directly proportional to the current flowing through it.

Question 22

Which of the following correctly describes Kirchhoff's Voltage Law (KVL)?

Accepted Answer

The algebraic sum of the voltages around a closed loop in a circuit must be equal to zero.

Answer

The sum of the currents entering a junction is equal to the sum of the currents leaving the same junction.

Answer

The voltage across a resistor is directly proportional to the current flowing through it.

Question 23

Which of the following is NOT a step in the application of Kirchhoff's Laws to an electrical circuit?

Accepted Answer

Identify the resistors in the circuit.

Answer

Write a loop equation for each independent loop.

Answer

Write a nodal equation for each node.

Answer

Solve the resulting system of equations.

Question 24

In a simple electrical circuit consisting of a battery, a resistor, and a capacitor connected in series, the current:

Accepted Answer

Has the same value throughout the circuit.

Answer

Is greatest in the battery.

Answer

Is greatest in the resistor.

Question 25

In a simple electrical circuit consisting of a battery, a resistor, and a capacitor connected in series, the voltage:

Accepted Answer

Has the same value throughout the circuit.

Answer

Is greatest in the resistor.

Answer

Is greatest in the capacitor.

Answer

Is greatest in the battery.

Question 26

A circuit has a resistor of 10 ohms and a capacitor of 100 uF connected in series. The circuit is connected to a 12 V battery. What is the time constant of the circuit?

Accepted Answer

1 millisecond

Answer

0.1 milliseconds

Answer

10 milliseconds

Answer

100 milliseconds