Question

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?

Answer 1

\[H=ki ^{2}\]
substitute H = 648 and i = 0.9.
find k
use i and k to find H for i=1.4A