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## Homework Statement

A dc machine(6W, 120V,1500rpm) is separately excited and delivers rated current at rated terminal voltage.Field winding is connected to 120V supply. R

_{fw}=100[tex]\Omega[/tex].

a) Determine the value of field current

b) Determine the value of R

_{fc}required.

## Homework Equations

V

_{f}= I

_{f}R

_{f}

## The Attempt at a Solution

In the question the value of V

_{f}is given, while both I

_{f}and R

_{f}are variables. So I need another relation to find out both the values. Is there another relation that I'm missing?