gen-briefly-explain-norton-s-theorem-and-one-common-misconceptio-a304

Briefly explain Norton's theorem and one common misconception about it.

# Norton's Theorem **Norton's theorem** states that any linear electrical network with voltage sources, current sources, and resistances can be replaced by an equivalent circuit consisting of: - A single **current source** (Norton current, I_N) - A single **parallel resistance** (Norton resistance, R_N) The Norton current equals the short-circuit current at the terminals, while the Norton resistance is the equivalent resistance seen from the terminals with all independent sources deactivated. ## Common Misconception **Misconception**: Norton's theorem can be applied to any circuit with any type of component. **Reality**: Norton's theorem applies only to **linear circuits**. It cannot be directly used with nonlinear components like diodes, transistors (in their nonlinear regions), or any components that don't obey Ohm's law. The theorem also requires bilateral components (same behavior in both directions) and time-invariant elements for the standard formulation.