# Energy Efficiency of an Appliance

**Formula:** `Efficiency = Output Energy / Input Energy`

The energy efficiency of an appliance is a measure of the ratio of useful output energy to the total input energy consumed. For instance, in electric heaters, ** outputEnergy** is the heat generated by the appliance, while

**is the electrical energy consumed to generate that heat. Energy efficiency is expressed as a decimal fraction between 0 and 1, where a higher number indicates greater efficiency. This concept is crucial for evaluating the eco-friendliness and cost-effectiveness of electrical appliances.**

*inputEnergy*Tags: Energy Efficiency, Appliance, Sustainability