When was power supply invented?

Answer 1

nobody can claim he invented the ups . it is a combination of theory or studies from different individual that leads to the production of ups or portion of a circuit taken adopted from an existing circuit to form a part of ups circuitry

Answer 2

Power was invented when man found fire. With fire he could eat cooked meat which made his brain develop above animals and he could sit and communicate over a fire with others.

Answer 3

Gottfried Wilhelm von Leibniz