What is voltage divider rule?

       The voltage across a single resistance or a combination of resistance in a series  circuit can be determine with out 1st finding the current is the voltage divider rule is applied 

   DIAGRAM:-

According to the ohm's law 

                                 V= IR 

                                 I=V/R  

       Total resistance Rt= R¹+R²

       =V¹= IR¹ =V/R¹=V/R¹.R² *R¹

       =V²= IR² =V/R²=V/R¹.R² *R²

  NOTE:-  

        V¹=VR¹/R¹R²

        V²= VR²/R¹R²

 Hence 

       The voltage divider rule said that a voltage across a resistance in a series circuit is equal to the value of the resistance time's the total voltage across the series resistance divided by the total resistance of the circuit.

                                                                       Thank you...

 

        

Resistance are connected in series !

 STATEMENT:-

                When two or more number of resistance are connected end to end so that the current flowing through all the element is same and the resistance are then said to be connected in series.

         

      Consider the resistance R¹,R²,R³ are connected in series across a supply of  'V'  volt 

       Let V¹, V² , V³ are the voltage drops of R¹ , R² , R³  respectively

          I= current flow in the circuit 

          According to the ohm's law V=IR 

    The voltage drop V¹= IR¹

                                    V²=IR²

                                    V³=IR³

         total voltage = V=V¹+V²+V³

                                =IR¹+IR²+IR³

                                =IR=I(R¹+R²+R³)

                                =R=R¹+R²+R³ (I cancel in both side)

     When number of resistance are connected in series then total resistance is equal to the sum of individual resistance

                                                          Thank you.......

Resistance are in parallel connection

 • If two or more number of resistance are connected such that one end of each resistance is connected to one common point while other ends of the resistance to another common point so, that the current flowing through each resistance different and the voltage across all resistance is the same then the circuit is connected in parallel 

Consider 

           Three resistance R¹, R², R³ are connected in parallel across a supply of 'v' 

     Let 

            I¹,I²,I³ are the current flowing through R¹,R² & R³ Respectively

       I= total current of the circuit according to the ohm's law

                                   V=IR , I= V/R 

   in parallel circuit current the voltage across all resistance voltage are same but current different

                        I¹=V/R¹ ,   I²=V/R²  ,   I³=V/R³

We know 

                       I = I¹ + I² + I³

                    = V/R¹ + V/R² + V/R³

                    =V ( 1/R¹ + 1/R² + 1/R³ )

                    =V/R = V ( 1/R¹ + 1/R² + 1/R³ )  

       = R = 1/R¹ + 1/R² + 1/R³     (V cancel in both side)

  Hence 

           When the number of resistance connected in parallel the reciprocal of the equivalent resistance of the combination is equal to the sum of the reciprocal of the individual resistance

                                                                       Thank you...

  

What is kirchhoff's current law?

 Kirchhoff's current law:-

        • This law is related to the current at the junction point of a circuit 

Statement:-  

         The algebraic sum of all the current's meeting at a point for a junction in an electric network is zero.

                         That means =£I =0

Explanation:- 

              

Let 

There are six conductor carrying current I1,I2,I3,I4,I5,I6 meeting at a junction at point 'o' 

  Assuming I1,I3,I5&I6 are the current flowing towards the junction 'o' ( that is incoming current) are taken as +ve & I2&I4 be the current flowing away from the junction 'o'(that is out going current) are taken as -ve 

Applying KCL to the junction core then 

           I1+(-I2)+I3+(-I4)+I5+I6=0

          I1-I2+I3-I4+I5+I6=0

          I1+I3+I5+I6=I2+I3 

Conclusion:-

              Sum of incoming current is equal to the sum of outgoing current.

Kirchhoff's law ?

 Kirchhoff's law:-

          Gustav Robert  kirchhoff's did a considerable amount of wark in the  principal of covering the  behaviour of the electrical circuit 

           He summed of his findings in set up two law's known as kirchhoff's law . Which are nothing but extention of ohm's law

         • The the law's are 2types 

    1st one is kirchhoff's current law (KCL) and second one is kirchhoff's voltage law (KVL)

What is transformer ?

 DEFINITION OF TRANSFORMER:-

Electrical transformers are machines that transfer electricity from one circuit to another with changing voltage level but no frequency change.  an increase in current will bring about an increase in the voltage and vice versa.

Transformers help improve safety and efficiency of power systems by raising and lowering voltage levels as and when needed. They are used in a wide range of residential and industrial applications, primarily and perhaps most importantly in the distribution and regulation of power across long distances.

What is series connection?

STATEMENT 

               When two or more no. Of electric elements are connected end to end so that the current flowing through all the elements is same and the elements said to be connected in series

       Hear 4 resistance R1, R2, R3, and R4  are connected in series connection 

What is ohm's law?

OHM'S LAW

               Whenever an electric potential difference an  'v' is apply across a conductor same current 'I' flows through it. The flow of current oppose by the resistance 'R'. A definite exist among the three quantity 

               This relation was given by George Simon ohm in 1826 so it is known as ohm's law

  STATEMENT :-

             The current flowing through a conductor is directly proportional to the potential difference maintain a cross it's ends , providing temperature and other physical condition kept constant.

           V proportional to I 

           V=IR(R constant)

     Where 

           I= current in AMP

          R= resistance in ohm

          V= potential difference in volt

                     I=V/R