# 4 Lecture

## Ideal voltage source

In circuit theory, an ideal voltage source is a theoretical concept used to model a power source that provides a constant voltage regardless of the current flowing through it.

## Important Mcq's Midterm & Finalterm Prepration Past papers included

Which of the following is a characteristic of an ideal voltage source?

a) It has a non-zero internal resistance

b) Its voltage output changes with time

c) Its voltage output remains constant regardless of the load

d) It can exist in reality

What is the internal resistance of an ideal voltage source?

a) Zero

b) Infinite

c) Non-zero but very small

d) Non-zero but very large

Can an ideal voltage source exist in reality?

a) Yes

b) No

What is the practical application of an ideal voltage source?

a) To supply power to a circuit

b) To serve as a reference voltage for other circuits

c) To measure the voltage of a circuit

d) None of the above

Answer: b) To serve as a reference voltage for other circuits

What happens to the voltage output of an ideal voltage source when it is short-circuited?

a) It decreases

b) It increases

c) It remains constant

d) It becomes zero

What is the significance of an ideal voltage source in circuit analysis?

a) It simplifies the analysis of complex circuits

b) It makes the analysis of complex circuits more difficult

c) It has no significance in circuit analysis

d) None of the above

Answer: a) It simplifies the analysis of complex circuits

Can the voltage output of an ideal voltage source change with time?

a) Yes

b) No

What is the difference between an ideal voltage source and a real voltage source?

a) An ideal voltage source has a non-zero internal resistance, while a real voltage source has zero internal resistance

b) An ideal voltage source varies its output based on external conditions, while a real voltage source provides a constant voltage output

c) There is no difference between an ideal voltage source and a real voltage source

d) None of the above

Answer: b) An ideal voltage source varies its output based on external conditions, while a real voltage source provides a constant voltage output

What happens to the current flowing through an ideal voltage source when it is short-circuited?

a) It remains the same

b) It becomes zero

c) It becomes infinite

d) None of the above

What are the limitations of an ideal voltage source?

a) It cannot exist in reality

b) It cannot supply an infinite amount of current

c) Both a and b

d) None of the above

Answer: c) Both a and b

## Subjective Short Notes Midterm & Finalterm Prepration Past papers included

What is an ideal voltage source?

Answer: An ideal voltage source is a theoretical concept in electrical engineering that provides a constant voltage output, regardless of the current flowing through it or any other external conditions.

What is the difference between an ideal voltage source and a real voltage source?

Answer: An ideal voltage source provides a constant voltage output, whereas a real voltage source may vary its output based on external conditions and has a non-zero internal resistance.

What is the internal resistance of an ideal voltage source?

Answer: An ideal voltage source has zero internal resistance.

What happens to the voltage output of an ideal voltage source when it is short-circuited?

Answer: The voltage output of an ideal voltage source remains constant even when it is short-circuited.

Can an ideal voltage source exist in reality?

Answer: No, an ideal voltage source is a theoretical concept and cannot exist in reality as it violates certain laws of physics.

What is the practical application of an ideal voltage source in electrical engineering?

Answer: The practical application of an ideal voltage source is to serve as a reference voltage for other circuits.

Can the voltage output of an ideal voltage source change with time?

Answer: No, the voltage output of an ideal voltage source is constant and does not change with time.

What happens to the current flowing through an ideal voltage source when it is short-circuited?

Answer: The current flowing through an ideal voltage source becomes infinite when it is short-circuited.

What is the significance of an ideal voltage source in circuit analysis?

Answer: An ideal voltage source simplifies the analysis of complex circuits as it provides a constant voltage output, making it easier to calculate circuit parameters such as voltage, current, and resistance.

What are the limitations of an ideal voltage source?

Answer: The limitations of an ideal voltage source are that it cannot exist in reality, and it cannot supply an infinite amount of current.

### Ideal voltage source

In circuit theory, an ideal voltage source is a theoretical concept used to model a power source that provides a constant voltage regardless of the current flowing through it. An ideal voltage source is characterized by two properties: a constant voltage and zero internal resistance. In this article, we will discuss the concept of an ideal voltage source and its importance in circuit theory. An ideal voltage source provides a constant voltage to the circuit, meaning that the voltage does not change with changes in the circuit current. This is in contrast to a real-world voltage source, such as a battery or power supply, which has some internal resistance and may not provide a constant voltage. The ideal voltage source is a theoretical concept used to simplify the analysis of circuits by assuming an ideal power source. The ideal voltage source is represented by a symbol in circuit diagrams, which consists of two parallel lines representing the terminals of the voltage source with a plus sign (+) and minus sign (-) indicating the polarity of the voltage. The voltage source symbol is usually labeled with the voltage value, which represents the voltage provided by the source. The zero internal resistance property of an ideal voltage source means that the source is capable of providing an infinite amount of current to the circuit without any drop in voltage. This property makes an ideal voltage source an efficient power source, and it is ideal for modeling circuits with large current demands. In real-world voltage sources, the internal resistance of the source affects the voltage output and the amount of current that can be drawn from the source. The internal resistance causes a voltage drop across the source when current is drawn from it. The voltage drop reduces the output voltage of the source, and the maximum amount of current that can be drawn from the source is limited by the internal resistance. The concept of an ideal voltage source is essential in circuit theory, as it simplifies the analysis of complex circuits. In circuit analysis, the ideal voltage source is often used as a reference voltage against which other circuit voltages are measured. The voltage drop across circuit elements, such as resistors and capacitors, can be easily calculated using the ideal voltage source as a reference. The ideal voltage source is also used to calculate the power dissipated in a circuit. The power dissipated in a circuit is equal to the product of the voltage and the current flowing through the circuit. The use of an ideal voltage source in circuit analysis simplifies the calculation of power dissipation by assuming that the voltage provided by the source is constant. In summary, an ideal voltage source is a theoretical concept used in circuit theory to simplify the analysis of circuits. The ideal voltage source is characterized by a constant voltage and zero internal resistance, which makes it an efficient power source. The concept of an ideal voltage source is essential in circuit analysis, as it simplifies the calculation of voltage drops and power dissipation in complex circuits. While an ideal voltage source does not exist in the real world, it is a useful theoretical concept that helps us understand the behavior of circuits.