The tiny SMBH is a power plant not because of its size, but because accretion extracts gravitational energy with extreme efficiency, limited only by the Eddington luminosity.
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Internal energy refers to the total energy of a system, including both kinetic energy and potential energy. Enthalpy, on the other hand, refers to the total energy of a system, including both internal energy and the energy associated with the pressure and volume of a system. The tiny SMBH is a power plant not