Electrical Ohm’s Law

In 1826 famous German scientist Gorge Simon Ohm invented a relation between voltage and current. He expressed the relation in a formula which is known as Ohm’s Law. This formula seems very simple but it has a great contribution in ...

Wheatstone Bridge

Wheatstone bridge is a bridge where four resistances are used. First and second resistance are connected in series; third and fourth resistance are also connected in series. Then the first and second two combinations are connected in parallel make Wheatstone ...

Biot Savart Law

To understand completely Biot Savart Law some important rules or laws should be known are Maxwell cork screw Law, Fleming’s right hand rule. If current passes through a conductor it creates a magnetic field around it. The direction of the ...

Electrical Shunt

Galvanometer is very sensitive device. Flow of huge amount current can burn galvanometer or displaces spring of it. For saving galvanometer a small value parallel resistor is connected across it and makes another way out of flowing current. Parallelly connected ...

1st Law of Thermodynamics

Scientist Rumford and Joule did experiment in thermodynamics. In 1847 Joule showed relation between heat and mechanical energy. He explained from his experiment when work done is converted to heat and heat is converted into work done fully. So work ...

Reversible process in thermodynamics

The process is called reversible process which can run back reversely with the same quantity of heat goes forward process. Forward heat and work done is equal with reverse heat quantity and work done.  There is no loss in reversible ...

What is entropy

Suppose in a football game a player always makes foul. So the other good players cannot concentrate in the game and referee also. The foul making player breaks the discipline of playing. So the total game cannot be conducted properly. ...