Question

1. Law of conservation of energy

2. What is meant by electrical equivalent of heat. (define )

3.What is electrical energy and what is thermal energy (explain with equations)

Answer 1

Sol:

1) law of conservation of energy states that energy can niether be created nor be destroyed , it can only transform from one form to the other that is initial energy of a system is equal to final energy of the system.

2) electrical equivalent of heat is the amount of electrical energy in joules which is equal to the 1 calorie of thermal energy or heat.

3) electrical energy is energy stored in a system when work is done on a charge in moving it from infinity to a point in the electric field of another charge. it is given by

E=( k qQ)/r

Where q and Q are charges , r is distance between charges and k is coulomb constant.

Thermal energy is the energy due to the movement of particle in a body which comes into play when particle are heated , they gain kinetic energy while heating and move more chaotically in the system and thus constitutes energy which is also known as heat energy.

Heat energy is given by

Q= mcΔT

Where m is mass , c is specific heat , ΔT is temperature change.