Question

when is the resistance is max

Answer 1

Suppose in a circuit the battery has emf 6V and internal resistance 3ohm. It is connected to an external resistance = R ohm. According to my book the maximum power dissipated is when R = 3 ( I.e. internal resistance)

Answer 2

maximum (which is R1+R2+⋯+RnR1+R2+⋯+Rn) is got when the resistors are connected in series, but I do not see a way to prove this. I searched and only found that this result is used without proof.

if any problems then comment me