Question

what is efficiency of an electric device?

Answer 1

The efficiency of an electric device in electronics and electricalengineering is defined as useful power output divided by the total electricalpower consumed (a fractional expression), typically denoted by the Greek small letter eta (η – 

Answer 2

The efficiency of an entity (a device, component, or system) in electronics and electrical engineering is defined as useful power output divided by the total electrical power consumed (a fractional expression), typically denoted by Greek small letter eta.