Efficiency is given by dividing the output power (W) by the effective input power (W).
(Efficiency)ˇá(Output power)/(Effective Input power)
In other words, this shows how much energy (electricity) is converted without waste. The efficiency for typical multiple output power supplies are around 70%. We, Nipron, aim to develop products with an efficiency over 80% under our business principles of preserving the global environment.