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Inductors in Circuits

a generator d...

Question

a generator develops an EMF of 12v and has a terminal potentiae difference of 115v, when tha armature current is 25A. What is resistance of the armature?

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Solution

$E m f o f t h e c e l l = 12 v o l t t e r m i n a l p o t e n t i a l i s a l w a y s l e s s t h a n t h e e m f o f t h e b a t t e r y . i t m u s t b e 11.5 v o l t p o t e n t i a l a c r o s s t h e a r m a t u r e = 12 - 11.5 = 0.5 v o l t c u r r e n t = 25 A r e s i s a t n c e = \frac{0.5}{25} = 0.02 o h m$

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