Thermodynamics of Kerr-Newman Black Hole

This paper reviews the solution of Einstein's field equations for rotating black holes coupled with Maxwell's electromagnetics. We derive the thermodynamic quantities of black hole, such as temperature, entropy, and energy with respect to mass, charge, and angular momentum, to derive the first law of thermodynamics. Also, we show that the black hole's entropy of the black hole will be directly proportional to the irreducible mass of the black hole. We present a comparison between black hole's possible maximal mass that can be extracted with it total mass.