# A typical 12v batter can deliver about 7.5 x 10^5 C

1. Jul 8, 2010

### atoreta88

PROBLEM: A typical 12v battery can deliver about 7.5 x 10^5 C of charge before dying. This is not very much. To get a feel for this calculate the maximum number of kilograms of water (100 degrees celsius) that could be boiled into steam (100degrees celsius) using energy from this battery.

I think I'm supposed to use the formula, E= qv, but I dont know what to do after that.

2. Jul 8, 2010

### Phrak

Using E=qv, your energy will be in units of Joules. How many Joules does it take to raise 1 kilogram of water 1 degree Celcius?

Edit: Oops. After re-reading the question, I see that the intent is to bring liquid water from 100C to vapor at 100C. For this, look up Latent heat of vaporization of water.

Last edited: Jul 8, 2010
3. Jul 8, 2010

### atoreta88

Thanks for responding. So all I have to do is look up that value for the latent heat of vaporization and that would be my final answer...I don't have to use any formula to calculate anything? I looked up the value and for 100 degrees C, the latent heat is 2260 kj/kg...would that be all?

4. Jul 8, 2010