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*[[ohms law]]
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 circuit must be zero.
*[[Ohm's law]]: the voltage across a resistor is the product of its resistance and the current flowing through it.
* the [[Y-delta transform]]
*[[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.
*[[Thevenin's theorem]]: any two-terminal combination of voltage sources and resistors is electrically equivalent to a single voltage source in series with a single resistor.
*[[Jacob Millman|Millman's method]]: the voltage on the ends of branches in parallel is equal to the sum of the currents flowing in every branch divided by the total equivalent conductance.
* See also [[Analysis of resistive circuits]].
Circuit analysis is the study of methods to solve linear systems for an unknown variable.
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