1. The problem statement, all variables and given/known data A dc machine(6W, 120V,1500rpm) is separately excited and delivers rated current at rated terminal voltage.Field winding is connected to 120V supply. Rfw=100[tex]\Omega[/tex]. a) Determine the value of field current b) Determine the value of Rfc required. 2. Relevant equations Vf= IfRf 3. The attempt at a solution In the question the value of Vf is given, while both If and Rf are variables. So I need another relation to find out both the values. Is there another relation that I'm missing?