VaneSharamyyl VaneSharamyyl 22-11-2016 Physics contestada What is the efficiency of a device that gives you 10 units of useful energy for every 100 units you put in it? A. 1 B. 0.5 What is the efficiency of a device that gives you 10 units of useful energy for every 100 units you put in it? A. 1 B. 0.5