in a simple electric circuit, in which you have a DC voltage generator, an internal resistence and the resistence of the load, why the maximum power that the generator is able to tranfer to load is when load resistence is equal to internal resistence? I try to think about it: if internal resistence is zero, power developed by load is V*I, where V is the voltage generator and I=V/RL; then if the internal resistence goes up, the power developed by load is V*I, where V minor than the voltage generator and I=V/(RI+RL), which is less then the previous current. So, why in the first case power isn't max?

- posted
18 years ago