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An energy source will supply a constant current into the load if its internal resistance is

1. very large as compared to the load resistance
2. equal to the resistance of the load
3. non-zero but less than the resistance of the load
4. zero

Correct answer: very large as compared to the load resistance

Solution

A constant current independent of the load is delivered by a current source, which has internal resistance very large compared with the load. (Zero internal resistance gives a constant-voltage source instead.)

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