In Joule’s experiments, the potential energy of a falling body 1 is transferred to the internal energy of a thermodynamic system

In Joule’s experiments, the potential energy of a falling body 1 is transferred to the internal energy of a thermodynamic system consisting of turbine 2 with blades 3 and water. As a result of the rotation of the turbine, the temperature of the wave increases. Write down the first law of thermodynamics for this case, taking into account that the thermodynamic system is isolated from the external environment. How do mechanical work A and the amount of heat Q in Joule’s experiments relate?

If the thermodynamic system is isolated, then all the mechanical work is transferred into the internal energy of water: U = A In Joule’s experiments: Q = A.