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<p> For example, no physical current source can operate when applied to an open circuit.  There are two characteristics that define a current source in real life.  One is its <b>internal resistance</b> and the other is its <b>compliance voltage</b>.  The compliance voltage is the maximum voltage that the current source can supply to a load.  Over a given load range, it is possible for some types of real current sources to exhibit nearly infinite internal resistance.  However, when the current source reaches its compliance voltage, it abruptly stops</p><p>
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