ANALYZING IN DIFFERENT WAYS

There are many ways in which we can analyze a circuit, the main processes are:


·  EQUIVALENT CIRCUITS
      1.-Circuits in series or in parallel
      2.-Star- triangle transformation
      3.-In a general way by elimination of the node in the net
      4.-Transformation of the sources

1.-

2.-

3.-

4.-

We also can analyze a circuit in a practical way using the materials explained in the first entrance.

The most common way in which e analyze a circuit is the series and parallel calculating method or the practical one. To solve some simple circuits is possible to do it by hand using the operations that I´ve already comment in other posts, but there are computer programs that makes our lives easier and allows us to design our circuit and does the pertinent calculations such as, Multisim.

Here i leave you a sample video of what Multisim consists in.

CALCULATING & FORMULAS

Today i´m going to explain the main formulas needed to calculate a theoretical circuit.


There are two different kind of circuits PARALLEL & SERIES CONNECTION


SERIES CONNECTION

Here the resistances are connected in series, but what´s a resistance?

Resistance is the  electrical resistance of an electrical element measures its opposition to the passage of an electric current. The SI unit of electrical resistance is the ohm (Ω). 

In this kind of connection the Total Resistance will be the sum of the differente resistances. In this case:

                                   

                                                                          RT= R1+R2+R3

PARALLEL CONNECTION

In this case the remittances are connected in parallel . Here the way to sum the resistances is different. We sum it like this:

1/RT=1/R1+1/R2+1/R3

This formula is 1/RT so don´t forget to turn up the final result and write the correspondent units.

Another interesting formula o be mentioned is the Ohm´s law

Ohm's law states that the current through a conductor between two points is directly proportional of the potential difference across the two points. Introducing the constant of proportionality, the resistance,one arrives at the usual mathematical equation that describes this relationship:

                                                                  

where I is the current through the conductor in units of amperes, V is the potential difference measured across the conductor in units of volts,and R is the resistance of the conductor in units of ohms. More specifically, Ohm's law states that the R in this relation is constant, independent of the current.

The Kirchoffs law stablishes that the difference of potential in a closed circuit it`s 0.