* Norton's theorem: Any network of voltage or current sources and resistors is electrically equivalent to an ideal current source in parallel with a single resistor.

* Norton's theorem, a theorem used in electronics to model electrical networks

Norton's theorem for linear electrical networks, known in Europe as the Mayer – Norton theorem, states that any collection of voltage sources, current sources, and resistors with two terminals is electrically equivalent to an ideal current source, I, in parallel with a single resistor, R. For single-frequency AC systems the theorem can also be applied to general impedances, not just resistors.

Norton's theorem is an extension of Thévenin's theorem and was introduced in 1926 separately by two people: Siemens & Halske researcher Hans Ferdinand Mayer ( 1895 – 1980 ) and Bell Labs engineer Edward Lawry Norton ( 1898 – 1983 ).

Norton's theorem -

Depending on perspective, this impedance can be modeled as being in series with an ideal voltage source, or in parallel with an ideal current source ( see: Thevenin's theorem, Norton's theorem, Series and parallel circuits ).

Figure 2: Small-signal low-frequency hybrid-pi model for amplifier driven by a Norton's theorem | Norton signal source

# REDIRECT Norton's theorem

* Norton's theorem: any two-terminal collection of voltage sources and resistors is electrically equivalent to an ideal current source in parallel with a single resistor.

# REDIRECT Norton's theorem