1. The problem statement, all variables and given/known data Electrical current is passed through a resistor immersed in a liquid in an adiabatic container. The temperature of the liquid is varied by 1 degree Celcius. The system consists solely of the liquid. Does heat or work flow across the boundary between the system and surroundings? Justify your answer. 3. The attempt at a solution Because it is an adiabatic container, heat does not flow across the boundary between the system and surroundings. So....d[tex]\Delta[/tex]U = q +w where q = 0. [tex]\Delta[/tex]U = w [tex]\Delta[/tex]U = Pext[tex]\Delta[/tex]V I'm having a hard trying to find the right way to explain that work is being done in physics lingo. Is it because temperature of the liquid increases the internal energy therefore work is being done? Thanks.