## Internal Energy with Constant Volume

$\Delta U=q+w$

Maria Davila 2I
Posts: 12
Joined: Fri Sep 26, 2014 2:02 pm

### Internal Energy with Constant Volume

For Quiz 1 Prep Winter 2014, question 2 seems tricky in the sense that

$\Delta U = q + w$
where volume is constant and since $w=-P\Delta V$
with v=0, then w=0 .

So in the end you will have

$\Delta U= q$
which is +2.50kJ.

Is this the correct thought process behind this?

Maria Davila 2I
Posts: 12
Joined: Fri Sep 26, 2014 2:02 pm

### Re: Internal Energy with Constant Volume

Actually, $\Delta V=0$
not V=0 .

Niharika Reddy 1D
Posts: 127
Joined: Fri Sep 26, 2014 2:02 pm

### Re: Internal Energy with Constant Volume

Yes, that's the reasoning behind it! Since volume is constant, there's no change in volume, thus work=0 and change in internal energy=q+w=q+0=q=+2.50kJ

Maria Davila 2I
Posts: 12
Joined: Fri Sep 26, 2014 2:02 pm

### Re: Internal Energy with Constant Volume

Thanks so much Niharika, you have been a great help in many of these posts!

Niharika Reddy 1D
Posts: 127
Joined: Fri Sep 26, 2014 2:02 pm

### Re: Internal Energy with Constant Volume

No problem, glad I was able to help! :)

### Who is online

Users browsing this forum: No registered users and 1 guest