State and define Norton’s Theorem?

Th´evenin’s equivalent circuit is a practical voltage source. In contrast, Norton’s equivalent circuit is a practical current source. This can be formally stated as:

“Any two-terminal, linear circuit, of resistors and sources, can be replaced by a single
current source in parallel with a resistor.”

To determine Norton’s equivalent circuit, Norton current, IN , and Norton resistance, RN , are required. The following steps outline the procedure required:

1. Remove the load resistance, RL.
2. IN is the SC current through the load terminals and
3. RN is the resistance across the load terminals with all sources replaced by their internal resistances. Clearly RN = RTH .

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