Voltage and Current Laws part1

Now that we have introduced ideal voltage and current sources, as well as the resistor.
There are two simple laws, Kirchhoff's current law and  Kirchhoff's voltage law, form the foundation for circuit analysis procedure.It is often possible to simplify circuits by combining elements that are connected in series or parallel -this applies to voltage and current sources as well as resistors and inductances.

What we should know before starting to study Kirchhoff's current law and  Kirchhoff's voltage law are Nodes, Paths, Loops, and Branches.

A point at which two or more element have common connection is called a Node.
Suppose that we at one node in a network and move through a simple element to the node at the other end. We then continue from that through a different element to the next node, and continue this movement until we have gone through as many elements as we wish. If no node was encountered more than once, then the st of nodes and elements that we have passed through is defined as a Path. If the node at which we started is the same as the node on which we ended, then the path is, by definition, a closed path or a loop.
Another term whose use will prove convenient is branch. We define a branch as a single path in network, composed of one simple element and the node at each end of that element. Thus, a path is particular collection of branches.
  
Kirchhoff's current law
We are ready to consider the first of two laws named for Gustav Robert Kirchhoff ( two h's and two f's)  who was born about the time Ohm was doing his experimental work. Kirchhoff's current law abbreviated KCL.
      The algebraic sum of the currents entering any node is zero.

Currents In suppose positive sign (+)
Currents Out suppose negative sign (-)



Continue Voltage and Current Laws part2  (Kirchhoff's voltage law)

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