The heat H in watts generated by an electric heating element varies directly as the square of the current i in amperes. A heating element produces thermal energy at a rate of 648 watts when the current is 0.9 amperes. What rate of heating in watts will be generated by a current of 1.4 amperes?

Question

anonymous · Answer

Set up a simple equation. We'll call the unknown "r"   ;)

$$H = i^2r$$

anonymous · Answer

You know H, you know i. Solve for r, and plug it into the same equation knowing i = 1.4 and r.

anonymous · Answer

is the answer 800?

anonymous · Answer

Yes, in this case "r" would be 800. 
Now plug 800 back into the same equation w/ i = 1.4

$$H = (1.4^2)(800)$$
That result will be the solution.

anonymous · Answer

1568?

anonymous · Answer

You got it.

anonymous · Answer

you are so awesome thank you so much. I have more!! :)