...1.15A at room temperature of 20 degree C? the field winding of a dc motor connected across a 230 V supply takes 1.15A at room temperature of 20 degree C . after working for some hours the current falls to 0.26A , the supply voltage remaining constant . calculate the final working temperature of the field winding . resistance temperature coeffecient of copper at 20 degree C IS 1/254.5 per degree C