Return of GoldStudies

Exams are nearing Its crunch time , so get ready with the exams over , I Start !
Simpler than the Dummies !!!!!!!!!!!!!!

Joule's Law 

Joule's Law :- [Joules law of Heat produced due to flow of Current]

1.) Heat (H) Produced in a conductor is directly proportional to the Square of the current (I) flowing through the conductor when the resistance (R) of the conductor and the time (t) of flow of current remains constant.

2.) Heat produced in a conductor is directly proportional to the resistance of the conductor when the flow of current and the time of flow remains Constant.

3.) Heat Produced in a conductor is directly proportional with the time of flow of current when the flow of current and the resistance of the conductor remains constant.

H = (I)^2.R.t/J                   [J=Joule's Constant/Mechanical equivalent of Heat]

J = 4.2 Joule/Calorie ; It is the amount of work done to produce unit calorie of heat.

Q.) 'J = 4.2 Joule/Calorie' - What do you mean by this ? 

Ans: Mechanical equivalent of heat (J) is defined as the amount of work done necessary or energy Supplied by an electrical Source to produce unit quantity of heat.

Hence the statement means to produce unit quantity i.e 1 cal of heat the amount of work done/the electrical energy supplied should be 4.2 Joules.

Daltons Atomic theory

John dalton developed the concept of atom & gave the world a theory regarding the constituent particles of matter.

   Postulates of Dalton's Atomic theory:-
1) According to his theory , all matter is composed of very tiny minute particles called atoms.The smallest particle of an  element was named as "simple atom "  that of an compound was name as "compound atom".
2)Atoms are indivisible  cannot be divided by any physical or Chemical means .
3)Atoms of the same element are identical in all respect & atoms of different elements are different in all respect.
3)Atoms can take part in chemical reactions , they combine in simple ratio of whole numbers to form compounds

[when we say atom we mean "simple atom"]

Hence the def:-The smallest indivisible indestructible Particle which may or may not take part in a chemical reaction.

But later on with the farther  advances of Science this theory was gradually proved to be obsolete and was finally discarded with the breakthrough inventions of the Sub-atomic particles.

The notable of all the atomic sub-particles are - Neutrons , Protons and Electrons.

Quadratic Equations

Def: An equation of unknown quantity (say x) in the form ax²+bx+c = 0 called a quadratic equation or a equation of the second degree  , where a,b & c are constants whereas "X" is an variable.


Since, its a quadratic equation so  The value of the co-efficient of "x^2" can never be zero , i.e the constant "a" never be zero ,
but the other co-efficients can be zero i.e b & c can be zero.