If `Delta U` and `Delta W` represent the increase in internal energy and work done by the sytem respectively in a thermodynamical process, which of the following is true ?

Options

A. `DeltaU=-DeltaW`, in a adiabatic process
B. `DeltaU=DeltaW`, in a isothermal process
C. `DeltaU=DeltaW,` in a adiabatic process
D. `DeltaU=-DeltaW`, in a isothermal process

Answer

A

Explanation

By first law of thermodynamics `DeltaQ=DeltaU+DeltaW`
for adiabatic expansion `DeltaQ=0`
`rArr DeltaU=-DeltaW`