About Kirchhoffs law

Kirchhoff's law is a fundamental law in circuit theory that states that the sum of all currents entering and leaving a node is zero. This law is important for understanding how circuits work and for designing efficient and reliable circuits. In this blog post, we will discuss Kirchhoff's law in detail and explore how it affects circuit design. We will also take a look at some examples to help you understand this concept better.

So, what exactly is Kirchhoff's law? In simple terms, it states that the sum of all currents entering and leaving a node is zero. The charge must be conserved in any closed system, which includes an electric circuit. This means that the total current flowing into a node must equal the total current flowing out of that node. If there is any imbalance, it indicates that there is a net flow of charge into or out of the node.

Now that we have a basic understanding of Kirchhoff's law, let's take a look at how it affects circuit design. This law is often used to simplify circuit analysis. By using Kirchhoff's law, designers can reduce the number of unknowns in a circuit. This makes it easier to solve for the desired values. Additionally, this law can be used to find voltage drops across resistors in a circuit.

Following are some of the multiple choice questions on the Kirchhoffs law with answers that will help the students in developing their knowledge.

Kirchhoffs law MCQ

1. Which of the following is Kirchhoff’s first law?

  • KCL
  • KVL
  • Current law
  • Both a and c

2. Which of the following is Kirchhoff’s second law?

  • KCL
  • KVL
  • Current law
  • Both a and c

3. Which of the following is the application of Kirchhoff’s law?

  • Determine current in circuit
  • Determine potential drop
  • Determine current direction
  • All the above

4. In Kirchhoff’s first law Σi = 0 at the junction is based on the conservation of

  • Charge
  • Momentum
  • Energy
  • Speed

5. Kirchhoff’s Current Law is based on

  • The charge can be accumulated at the node
  • Energy is stored at the node
  • Charge cannot be accumulated at the node
  • Depending on the circuit charge can be accumulated at the circuit

6. Which of the following field derives Kirchhoff’s loop law?

  • Electro magnetic
  • Electrostatic
  • Magnetic
  • Electrical

7. Kirchhoff s law is applicable to

  • d.c. circuits only
  • a.c. circuits only
  • passive networks only
  • Both ( a ) & ( b )

8. Kirchhoff's law states that:

  • The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body
  • The total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
  • The wave length corresponding to the maximum energy is proportional to the absolute temperature
  • All of above

9. The method of Kirchhoff’s law is used to solve the questions with _____.

  • node voltage method
  • branch current method
  • loop/mesh current method
  • all are correct

10. _________ method of complex network is used to solve the questions of simple circuits, Kirchhoff’s law, loop analysis, node analysis, superposition theorem and Reciprocity Theorem.

  • Direct
  • In-direct
  • Equivalent
  • all are correct

11. It is necessary to find ______ of current to solve the circuit according to Kirchhoff’s Laws.

  • value
  • direction
  • speed
  • symbol

12. In any network, the algebra sum of the currents meeting at a junction point is zero, which is Kirchhoff’s Current Law

  • True
  • False

13. AC and DC both types of circuits can use Kirchhoff’s Law.

  • True
  • False

14. With the help of Kirchhoff’s Current Law (KCL) and Kirchhoff’s Voltage Law (KVL), you can find equivalent ________ and ________ of different conductors

  • current, voltage
  • current, frequency
  • resistance, voltage
  • resistance, current

15. Which of the following is the equation of Kirchhoff’s voltage law?

  • Del X B = -dB/dt = 0
  • Del X E = -dB/dt = 0
  • Del X H = -dB/dt = 0
  • Del X E = -dB/dt = 1

16. Who introduced ohms law?

  • Charles
  • Fredrick
  • Kirchhoff’s
  • George ohms

17. Which of the following are the disadvantages experienced by Kirchhoff’s law?

  • Ignores current flow through capacitors
  • Neglects other components electric field
  • Incorrect high frequency value of AC is obtained
  • All the above

18. Which of the following is used for representing Kirchhoff’s equations?

  • Integration
  • Matrix
  • Differentiation
  • Both a and b

19. Identify the first step of mesh analysis?

  • Assign each node with a resistance value
  • Every loop is assigned with loop based current value
  • Kirchhoff’s KVL is implemented for every loop
  • Perform mathematical solvation to obtain loops currents value

20. Which basic law should be followed to analyse the circuit?

  • Newton’s law
  • Faraday’s law
  • Amperes law
  • Kirchhoff's law

21. Which of the following electric parameters do Kirchhoff law calculate?

  • Voltage
  • Resistance
  • Current
  • Both a and c

22. Who introduced currents law?

  • Henry
  • Charles Danial
  • Gustav Kirchhoff
  • Both b and c

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