Question:
In case of ideal current sources, they have ____.
In case of ideal current sources, they have ____.
Show Hint
Contrast this with voltage sources:
- Ideal Voltage Source: Zero internal resistance (connected in series).
- Ideal Current Source: Infinite internal resistance (connected in parallel).
Updated On: May 19, 2026
- zero internal resistance
- low value of voltage
- large value of current
- infinite internal resistance
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
An ideal current source is a theoretical circuit element that maintains a constant current regardless of the voltage across its terminals or the load resistance connected to it.
Step 2: Detailed Explanation:
Internal resistance in a source is considered to be in parallel with the current.
• If the internal resistance were low or zero, the current would bypass the external load and flow through the internal path (short circuit).
• For a source to deliver $100\%$ of its current to any external load, its internal parallel path must be a complete "open circuit."
• An open circuit has infinite resistance ($\infty\,\Omega$). Therefore, an ideal current source must have infinite internal resistance to ensure the current remains independent of the external circuit.
Step 3: Final Answer:
Ideal current sources have infinite internal resistance.
An ideal current source is a theoretical circuit element that maintains a constant current regardless of the voltage across its terminals or the load resistance connected to it.
Step 2: Detailed Explanation:
Internal resistance in a source is considered to be in parallel with the current.
• If the internal resistance were low or zero, the current would bypass the external load and flow through the internal path (short circuit).
• For a source to deliver $100\%$ of its current to any external load, its internal parallel path must be a complete "open circuit."
• An open circuit has infinite resistance ($\infty\,\Omega$). Therefore, an ideal current source must have infinite internal resistance to ensure the current remains independent of the external circuit.
Step 3: Final Answer:
Ideal current sources have infinite internal resistance.
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