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An ideal current source has
  • a)
    infinite source resistance
  • b)
    zero source resistance
  • c)
    large value of source resistance
  • d)
    finite value of source resistance
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
An ideal current source hasa)infinite source resistanceb)zero source r...
Ideal current source: An ideal current source has infinite resistance. Infinite resistance is equivalent to zero conductance. So, an ideal current source has zero conductance.
Practical current source: A practical current source is equivalent to an ideal current source in parallel with high resistance or low conductance.
Ideal and practical current sources are represented as shown in the below figure:

Important Points
Ideal voltage sourceAn ideal voltage source have zero internal resistance.
Practical voltage source: A practical voltage source consists of an ideal voltage source (VS) in series with internal resistance (RS) as follows.
An ideal voltage source and a practical voltage source can be represented as shown in the figure.
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An ideal current source hasa)infinite source resistanceb)zero source r...
Understanding Ideal Current Sources
An ideal current source is a fundamental component in electrical engineering, characterized by its unique properties.
Definition of an Ideal Current Source
An ideal current source maintains a constant current regardless of the voltage across it. This means that it can provide a specific amount of current to a load without being influenced by the load's resistance.
Key Characteristics of Ideal Current Sources
- Infinite Source Resistance:
- An ideal current source is defined to have infinite source resistance. This means that it can maintain a consistent output current even if the load impedance varies significantly.
- With infinite resistance, the source can adjust its voltage to ensure that the current remains unchanged, no matter how much the load tries to draw.
- Current Independence:
- The output current does not change with varying load conditions. This is crucial for applications where stable current is essential, such as in biasing transistors or driving LEDs.
Comparison with Real Current Sources
- Finite Source Resistance:
- Real current sources have finite source resistance, which causes their output current to change with varying load conditions.
- As the load impedance decreases, the real current source may not be able to maintain the desired current, leading to inefficiencies.
- Importance in Circuit Design:
- Understanding the ideal current source concept is vital for designing circuits where precise current control is necessary, as it helps in predicting circuit behavior under different loading conditions.
In conclusion, the correct answer to the question is option 'A' because an ideal current source is characterized by its infinite source resistance, ensuring a constant output current regardless of the load.
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An ideal current source hasa)infinite source resistanceb)zero source resistancec)large value of source resistanced)finite value of source resistanceCorrect answer is option 'A'. Can you explain this answer?
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