Are these two concept the same or different for semiconductors? Some power MOSFETS have power ratings in the hundreds of watts, and that's way too high for heat loss.
I try to understand 'power dissipation' as in power these devices can sustain/allow passing. For MOSFETs, it's Vds * Id+Vgs * Ig. For diodes, it's Vdrop * ID. Also, where does the energy get dissipated to? Other than becoming heat that causes the inefficiencies.