A number of electrical laws apply to all electrical networks. These include:
*[[Kirchhoff's circuit laws#Kirchhoff's current law|Kirchhoff's current law]]: The sum of all currents entering a node is equal to the sum of all currents leaving the node.
*[[Kirchhoff's circuit laws#Kirchhoff's voltage law|Kirchhoff's voltage law]]: The directed sum of the electrical potential differences around a loop must be zero.
*[[Ohm's law]]: The voltage across a resistor is equal to the product of the resistance and the current flowing through it.
*[[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.
*[[Thévenin's theorem]]: Any network of voltage or current sources and resistors is electrically equivalent to a single voltage source in series with a single resistor.
*[[superposition theorem]]: In a linear network with several independent sources, the response in a particular branch when all the sources are acting simultaneously is equal to the linear sum of individual responses calculated by taking one independent source at a time.
Other more complex laws may be needed if the network contains nonlinear or [[Reactance (electronics)|reactive]] components. Non-linear self-regenerative [[Heterodyne|heterodyning]] systems can be approximated. Applying these laws results in a set of [[simultaneous equations]] that can be solved either algebraically or numerically.
==Методи за осмислување==