# 4 Lecture

## PHY301

### Midterm & Final Term Short Notes

## 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

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**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

**Answer: c) Its voltage output remains constant regardless of the load**

**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

**Answer: a) Zero**

**Can an ideal voltage source exist in reality?**

a) Yes

b) No

**Answer: 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

**Answer: c) It remains constant**

**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

**Answer: 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

**Answer: c) It becomes infinite**

**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

Download PDF
**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.