The heat added to a thermodynamic system minus the work done is equal to which of the following? a. the heat lost from the system b. the internal energy c. the total heat added to the system d. the carnot efficiency of the system e. the thermodynamic increase

B.the internal energy

Explanation:

To be more precise, it is equal to the variation of internal energy. In fact, this is summarized by the first law of thermodynamics, which states the following:

where

is the variation of internal energy of a system

is the heat added to the system

is the work done by the system

Using this sign convention, we observe that:

- When heat is added (positive Q), the internal energy increases, while when heat is removed from the system (negative Q), the internal energy decreases

- When work is done by the system (positive W), the internal energy decreases, while when work is done by the surrounding ON the system (negative W), the internal energy increases.