Ohm’s Law and It's Equation,Formula and Limitations

The most basic quantities of electricity are voltage, current and resistance. Ohm's law shows a simple relationship between these three quantities, hence this law can be considered as the most basic law of electrical engineering. This is diamond (priceless) of electrical engineering used to calculate and analyze electrical circuits and quantities related to power, efficiency and impedance.

OHM'S LAW :

GEORG OHM'S:

GEORG OHM

 ABOUT GEORG OHM:

GO TO:GEORG OHM

 

 

 

 STATEMENT: 

"whenever a potential difference or voltage is applied across a resistor of a closed circuit, current starts flowing through it. This current is directly proportional to the voltage applied if temperature and all other factors remain constant"  

Mathematically,

Now putting the constant of proportionality we get,

Transformer defination and Working principle

TRANSFORMER:

what is transformer?

Transformer is a static device which transforms electrical energy from one circuit to another without any direct electrical connection and with the help of mutual induction between two windings and according toFaraday Law's Of Electromagnetic induction . It transforms power from one circuit to another without changing its frequency but may be in different voltage level.

WORKING PRINCIPLE OF A TRASNFORMER:

Transformer works on the principle of mutual induction two coils or Faraday Law's Of Electromagnetic induction.When current in the primary coil is changed the flux linked to the secondary coil also changes. accordingly an EMF is induced in the secondary coil due to Faraday law's of electromagnetic induction.this induced EMF is directly proportional input applied.

 

 

principle of working

Parts of transformer:

• Primary Winding of transformer - which produces magnetic flux when it is connected to electrical source.
• Magnetic Core of transformer - the magnetic flux produced by the primary winding, that will pass through this low reluctance path linked with secondary winding and create a closed magnetic circuit.

• Secondary Winding of transformer - the flux, produced by primary winding, passes through the core, will link with the secondary winding. This winding also wounds on the same core and gives the desired output of the transformer.

SOURCES:

 Wikipedia and books.