If \[\Delta Q\] and \[\Delta W\] represent the heat supplied to the system and the work done on the system respectively, then the first law of thermodynamics can be written as [Roorkee 2000]

• A.            \[\Delta Q=\Delta U+\Delta W\]                                     
• B.            \[\Delta Q=\Delta U-\Delta W\]
• C.            \[\Delta Q=\Delta W-\Delta U\]                                      
• D.            \[\Delta Q=-\Delta W-\Delta U\] where \[\Delta U\] is the internal energy