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.
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?