Theenergyloss(heatgeneration)inadigitalamplifierisverylow,sinceeachtransistorworkslikeaswitchandnot,asinananalogamplifier,asavariableresistance,whichcanbeopenedandclosedmoreorless.

Please segment the words.
The energy loss (heat generation) in a digital amplifier is very low, since each transistor works like a switch and not, as in an analog amplifier, as a variable resistance, which can be opened and closed more or less.