enter image description here

enter image description here-2 The first image gives the context about what i am gonna ask. Now in the second image i can understand upto the point where the book talks about kinectic theory in the second paragraph , after i am totally blank as to how it makes further calculations of energy and it also seems to deviate from the fact that heat energy is lost when it flows from A to B . It says energy of electrons at A is E and at B is E - ∆E . In this case i am unclear as to what it means by "energy transported" , i thought the energy transported to B from A was E - ∆E , since A has electrons with energy E and after loss of ∆E , remaining energy would be present with electrons at B . And then it gives another expression for energy transported from B to A , which makes no sense because at first it said heat was flowing from A to B . And then it says "net energy transported" from A to B , which again puts me into confusion as i am not able to differentiate between what the book said was "energy transported from A to B" and then "net energy transported" . Can anybody explain what is going on here? If i follow what is being done here ,it looks like i can just double the value of any energy flowing through two different points


1 Answer 1


All right, let’s we have a rod in which energy varies from point to point in the rod continuously. So, let’s assume that at point A the energy is $E$ and just after the point A (please I don’t want to clarify what “just after” really means) there is a point B such that the energy difference between these two points is $\Delta E$.

So, any particle at A have more energy than at B by the amount $\Delta E$. When the particle move from A to B it will lose $\Delta E$ amount of energy and this will try to establish the equilibrium of energy all along the rod.

Particles will not flow spontaneously from B to A.

Hope it helps!

  • $\begingroup$ But what about the calculations they have made in the book , are they correct ? $\endgroup$ Feb 10, 2020 at 9:25
  • $\begingroup$ As far as only those two pages are concerned it’s very hard to say that “electrons will from B to A” otherwise all calculations are correct. What are your problems? $\endgroup$
    – user240696
    Feb 10, 2020 at 9:57
  • $\begingroup$ I explained my problems in the question itself $\endgroup$ Feb 10, 2020 at 12:15
  • $\begingroup$ @Maxwell’sGhost Then I’m sorry I cannot answer you. $\endgroup$
    – user240696
    Feb 10, 2020 at 12:33
  • $\begingroup$ Okay , but may i know why ? $\endgroup$ Feb 10, 2020 at 12:34

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.