The efficiency is obtained by dividing the delivered power by the absorbed power and is normally expressed as a percentage. For example, an efficiency of the 75% of a pump indicates that only 75% of the absorbed power is converted into delivered power, with the remaining 25% being lost due to friction. Therefore, the higher the efficiency of a pump, the smaller the portion of absorbed power being lost. The efficiency of a pump expresses better than any other parameter the quality of the pump the related savings in terms of operating costs.