Definition check: In network theorems, the Norton equivalent current corresponds to which quantity at the output terminals?

Introduction / Context:
The Norton and Thevenin equivalents simplify complex linear circuits. Correctly identifying the Norton current is essential for quick hand analysis and for converting between Norton and Thevenin forms.

Given Data / Assumptions:

• Linear bilateral network assumptions apply.
• We are concerned with the equivalent seen at two output terminals.
• Independent sources are active; dependent sources are treated per standard procedures.

Concept / Approach:

The Norton form is a current source IN in parallel with an equivalent resistance RN. The defining current IN is by definition the short-circuit current at the output terminals (i_sc). RN equals the Thevenin resistance RTH, found by deactivating independent sources or via test sources when dependent sources exist.

Step-by-Step Solution:

Verification / Alternative check:

Conversion check: The Thevenin equivalent voltage VTH equals IN * RN. Measuring either i_sc or VTH with RN provides mutual confirmation of the equivalence.

Why Other Options Are Wrong:

'The current through the load' depends on load value and is not an invariant equivalent parameter. 'Open-current from the source' is undefined; open-circuit relates to Thevenin voltage, not Norton current. 'None of the above' is incorrect because a standard definition exists.

Common Pitfalls:

Confusing i_sc (Norton current) with I_load at arbitrary loads; forgetting that RTH = RN during conversions.

Final Answer:

the short circuit current