What is the difference between the total power and the output power of the power supply? How to calculate the maximum output power?

What is the difference between the total power and the output power of the power supply? How to calculate the maximum output power?


The total power of the power supply is EI
The output power of the power supply is UI (or I ^ 2 * r)
Output power: P = I ^ 2 * r = e ^ 2 / (R + R) ^ 2 * r = e ^ 2 / [(R-R) ^ 2 / R + 4R]
So when r = R, the maximum output power is Pmax = e ^ 2 / (4R)



The series circuit current flows from the positive pole of the power supply to the negative pole through the electric appliance____ The parallel circuit has branches, and the paths of current flow are_


There's only one
At least two