External characteristic differ from an internal characteristic in separately excited DC generator by _________

External characteristic differ from an internal characteristic in sepa

1.	External characteristic differ from an internal characteristic in separately excited DC generator by _________
A.	I<sub>a</sub> *R<sub>a</sub>
B.	I<sub>f</sub> *R<sub>a</sub>
C.	I<sub>L</sub> *R<sub>L</sub>
D.	I<sub>f</sub> *R<sub>f</sub>
Answer» B. I<sub>f</sub> *R<sub>a</sub>