A New Approach to Establishing Mass-Energy Equivalence

In the present work, Einstein’s formula, which establishes mass-energy equivalence, has been obtained using Joule’s law. For this purpose, the equality of the kinetic energy of the translational motion of molecules to the amount of energy released by direct current in the form of heat is used. It is noted that the emerging direct current is equivalent to the voltage drop at the ends of the resistance in a finite time. Attention is drawn to the fact that the translational velocity of electrons for different metals is different, and the speed of light is the limit to which only the velocities of electrons in different metals can tend. The proposition is used according to which the dimension of resistance is inverse to the dimension of velocity. As a result of taking into account this proposition and Einstein’s second postulate, on the basis of Joule’s law, a ratio establishing mass-energy equivalence has been obtained.