What is the wattmeter reading of the transformer when it is on open circuit condition? All Questions › Category: Electrical Machines › What is the wattmeter reading of the transformer when it is on open circuit condition? 0 Vote Up Vote Down Singu.Aditya asked 4 years ago I need one word answer 1 Answers 0 Vote Up Vote Down Singu.Aditya answered 4 years ago The wattmeter reading of the transformer when it is open circuited means it reads the iron losses of the transformer