# Math Help - energy and time problem

1. ## energy and time problem

How long will it take to produce 150 kW with 780 J of energy?

I got
E= P x T 780J = 150kW x T 780/150000 = T = 0.0052 seconds only a short time will be able to be used.

2. I didn't get that... but then again I am only a student in physics.
Here's what I got:

$1\mbox{WattSecond} = 1 \mbox{Joule}$

$\frac{\mbox{Watts}}{\mbox{Joules}} = \mbox{time}$

$\frac{150000W}{780J} \approx 192.3s$

http://en.wikipedia.org/wiki/Joule was where I got the 1Ws = 1J from.