We consider a thermodynamic system. If $\Delta U$ represents the increase in its internal energy and $W$ the work done by the system,which of the following statements is true?
- A$\Delta U = -W$ is an adiabatic process
- B$\Delta U = W$ in an isothermal process
- C$\Delta U = -W$ in an isothermal process
- D$\Delta U = W$ in an adiabatic process
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