# Top 20 MCQs on Basic Electrical Laws and Theorems

Given below is the list of * top 20 MCQs on Basic Electrical laws and theorems*. Test your basic knowledge of Ohm’s, Kirchhoff’s, Norton, Thevenin, Millman’s theorem, current divider, voltage divider, delta, wye, series, and parallel networks.

1. The correct statement of Ohm’s law:

- Voltage is inversely proportional to the power
- Current is inversely proportional to the applied voltage
- Power is a product of resistance times voltage
- Increase in resistance decreases current for constant voltage

Correct answer: 4. Increase in resistance decreases current for constant voltage

2. The voltage divider is applied in:

- Parallel circuits
- Series circuits
- None of these

Correct answer: 1. Series circuits

3. P = VI is a statement of:

- Ohm’s law
- Joule’s law
- KCL
- KVL

Correct answer: 2. Joule’s law

4. Power dissipated by a 20 Ω resistor connected to 20 V source:

- 1 watt
- 20 watts
- 400 watts
- 1600 watts

Correct answer: 2. 20 watts

Similar: Most Important MCQs on Basic Electrical Units

Solution: P = V2/R = [20 * 20] / 20 = 20 watts

5. KVL is valid for:

- Parallel circuits
- Series circuits
- None of these

Correct answer: 1. Series circuits

6. The current divider rule is applied to:

- Parallel circuits
- Series circuits
- None of these

Correct answer: 1. Parallel circuits

Revise 9 Basic Electrical laws and theorems

7. KCL is valid for:

- Parallel circuits
- Series circuits
- None of these

Correct answer: 1. Parallel circuits

8. The statement: Energy can neither be created nor destroyed belongs:

- Kelvin law
- Neil law
- Law of conversation of Energy
- Energy Creation Destruction theory

Correct answer: 3. Law of conversation of energy

9. A circuit with various parallel voltage sources is solved using:

- Superposition theorem
- Norton theorem
- Kelvin law
- Millman’s theorem

Correct answer: Millman’s theorem

10. Norton theorem cannot be applied to:

- Resistor
- Diodes
- Linear bilateral networks
- All of above

Correct answer: 2. Diodes

11. Norton theorem provides:

- Current source with parallel resistor
- Current source with series resistor
- Voltage source with parallel resistor
- Voltage source with series resistor

Correct answer: 1. Current source with parallel resistor

12. The circuit with multiple independent current sources is solved using:

- Kirchhoff’s current law
- Substitution theorem
- Superposition theorem
- Norton theorem

Correct answer: 3. Superposition theorem

13. Reciprocity theorem should be applied to:

- Single source circuits
- Multiple source circuits
- 2, 4, 6, or 8 source
- None of these

Correct answer: 1. Single source circuits

14. Delta network is also known as:

- Tee
- Pi
- Wye
- None

Correct answer: 2. Pi

15. Thevenin theorem provides:

- Current source with parallel resistor
- Current source with series resistor
- Voltage source with parallel resistor
- Voltage source with series resistor

Correct answer: 4. Voltage source with series resistor

16. Tee network is also known as:

- Delta
- Pi
- Wye
- None

Correct answer: 3. Wye

17. Branch current analysis involves:

- KCL
- KVL
- Linear equations
- All of these
- None of these

Correct answer: 4. All of these

18. Two unequal series sources:

- Can be solved using KCL
- Violate KCL
- Follow KVL
- None of these

Correct answer: 2. Violate KCL

19. Mesh analysis requires:

- KCL only
- KVL only
- Both
- None

Correct answer: 2. KVL only

20. Multiple current sources in parallel can be reduced to:

- Single current source
- Single voltage source
- Single resistance
- None of these

Correct answer: 1. Single current source