In general, when it is equal to the sum of the resistances of other resistors, it becomes the largest.

I was the first. I changed and ran down. .....

I=p/(r+R)(r is the sum of other resistances)

P=I^2*R=p^2/(r^2+2rR+R^2)*R

=p^2/(r^2/R+2r+R)

Small denominator, big fraction.

R2/R+R > through the average inequality; =2R is true if and only if r = r

At this time, the denominator is the smallest and the score is the largest.