the power (P) generated in a electrical circuit is proportional to the square of the current ( L amps) . when the power is 108, the current is 6 amps.

Question

a_ write down the relationship between P,L and the constant of variation k .
b_ calculate the value of k
c_ calculate the value of L when p= 75 watts

Answer 1

P = k L^2
when P=108, L=6

108 = 36K
k = 3

P = 3L^2

75 = 3L^2
L^2 = 25
L = 5